(Originally written March 7, 2007 in Book 13)
Anselm's Debate with Gaunilo
Gaunilo objected to Anselm's argument on a few grounds:
1. It is built on the false premise that whatever exists in the mind must exist outside the mind.
2. If God's non-existence were really inconceivable then no one could doubt his existence.
3. We cannot even form the concept of the most perfect being possible.
4. The existence of God cannot be inferred from the idea of a perfect Being anymore than the existence of a perfect island can be inferred from the idea of a perfect island.
5. God's nonexistence is no more inconceivable than my own nonexistence. I can conceive of my own nonexistence so I can conceive of God's nonexistence too.
6. God's existence must be proved before we can discuss his essence. Otherwise there is no basis for saying he is the most perfect Being possible.
Anselm's replies:
1. The argument only applies to an absolute perfect Being.
2. God's nonexistence is affirmable, but not conceivable.
3. We do understand the word because of 6 facts:
- It is a common word
- It is a familiar word
- Our faith and conscience provide content for it
- Conceptions do not have to be in terms of sensible images
- God can be understood indirectly
- Those who deny that they can have a conception of God must have a conception of what they cannot conceive
4. The idea of an absolutely perfect Being cannot lack anything, especially being; whereas, the idea of anything else can lack being.
5. If it is possible for a necessary being a necessary being must exist. It's nonexistence is inconceivable.
6. We can compare ideal characteristics prior to ascertaining their reality.
Anselm charged Gaunilo with misunderstanding the argument as:
1. God is the greatest of all Beings
2. It is greater to exist in reality then merely in the understanding.
3. Therefore, God must exist in reality.
Anselm states this argument confuses the greatest actual Being with the greatest possible being.
Aquinas' objection to the ontological argument
Aquinas understood Anselm to mean:
1. God is by definition that then which nothing greater can be conceived
2. What exists actually and mentally is greater than that with exists only mentally.
3. Therefore, God must exist actually.
Aquinas had 3 objections to the argument:
1. Not everyone understands the term "God" to mean that then which nothing greater can be conceived.
2. Even if everyone did understand that the term God meant this, it does not follow that God exists actually.
3. The proposition "God exists" is self-evident, but not self-evident to us.
Descartes' formulation of the Ontological Argument
Descartes' argument (2nd form)
1. It is logically necessary to affirm of a concept whatever is essential to the nature of that concept.
2. Existence is a logically necessary part of the concept of a necessary Existent.
3. Therefore, it is logically necessary to affirm that a necessary Existent does exist.
"If God by definition cannot exist, then he must exist" (128).
Descartes' argument (1st form)
1. Whatever we clearly and distinctly perceive of something is true.
2. We clearly and distinctly perceive that the conception of an absolutely perfect Being necessitates the existence of that Being.
3. Therefore, it is true that an absolutely perfect Being cannot lack existence.
Descartes qualified his argument in three ways:
1. This argument applies only to an absolutely perfect or necessary being.
2. It is not necessary for anyone to think of God, but if and when he does he must conceive of God as necessarily existing.
3. To conceive of God as a necessary Being is not imaginary, but necessary. The concept of a necessary being must be what it is and cannot be any other way. Thus, the concept of a necessary Being cannot be the product of one's imagination.
The debate between Caters and Descartes
Caters the priest agreed with Thomas Aquinas in that he felt the Ontological Argument proved only a conceptual and not a real existence of God.
Caters contended that the words "existent lion" is conceptually necessary, but it does not prove that a lion exists.
Descartes stated that Aquinas refuted an argument that stated existence is concluded from the meaning of God, not his own argument.
Other reactions to Descartes' proofs
Other 17th century philosophers reacted negatively to Descartes' arguments. They restated his argument this way.
1. If it is not contradictory that God exists, then it is certain that He exists.
2. It is not contradictory that God exists.
3. Therefore, it is certain that God exists.
They objected to Descartes' argument in two ways:
1. The minor premise can be doubted or denied.
2. Descartes admitted that his idea of God was inadequate and thus unclear. By Descartes definition of truth as "clear and distinct" then it is untrue.
Descartes' replies:
1. God's nonexistence is noncontradictory in either of two senses of the word:
- Whatever does not disagree with human thought (God is noncontradictory)
- What cannot be known by the human mind (no one could know anything, thus God's existence is noncontradictory)
2. Even if our concept of God is inadequate it does not follow that it is contradictory. God's necessary existence is a clear concept, thus the argument is unaffected by lack of clarity in other aspects of God's nature.
The debate between Gassendi and Descartes.
Pierre Gassendi, a skeptic, contended that Descartes confused existence with a property. He argued with 7 points:
1. The essence of a thing can be thought of apart from its existence.
2. Existence is not a property.
3. Essence and existence can be distinguished only in thought, not in reality.
4. We are just as free to think of God as not existing as we are to think of Pegasus as not existing.
5. We need demonstration that God exists, not merely the assumption that it does.
6. Descartes did not really prove that nonexistence is incompatible with God.
Descartes replied to Gassendi with four points:
1. Existence is a property in that it is attributable to something. Necessary existence is a necessary property of a necessary being.
2. We cannot compare the existence of that which is contingent to the existence of what is necessary.
3. It is not begging the question to include existence among the attributes of a necessary Existent.
4. God's existence and essence are inseparable.
Leibniz's Consideration of the Ontological Argument
Leibniz held that the ontological argument was valid but sensed that it was necessary to demonstrate the concept of God was not contradictory.
He stated
1. If it is possible for an absolutely perfect Being to exist, then it is necessary that it exists.
2. It is possible (noncontradictory) for an absolutely perfect being to exist.
3. Therefore, it is necessary that an absolutely perfect Being exist.
To support his minor premise Leibniz argued that:
1. A perfection is a simple and irreducible quality without any essential limitations.
2. Whatever is simple cannot conflict with other irresolvably simple qualities (they differ in kind).
3. Whatever differs in kind with another cannot conflict with it.
4. Therefore, it is possible for on Being (God) to possess all possible perfections.
Three objections to Leibniz's arg.
1. It assumes that some qualities are essentially positive and others negative, but this may not be the case.
2. Leibniz assumes that some qualities are intrinsically simple, but Wittgenstein showed that what is simple in one conceptual system may be complex in another.
3. It depends on the principle of the actual identity which is conceptually indiscernible.
Spinoza's Ontological Proof
Like Descartes, Spinoza held that God was mathematically demonstrable.
Spinoza's argument:
1. There must be a cause for everything, either for its existence or for its nonexistence.
2. A necessary Being (God) necessarily exists, unless there is an adequate cause to explain why he does not exist.
3. There is no adequate cause to explain why he does not exist.
4. Therefore, a necessary Being, necessarily exists.
One may object to Spinoza's insistence that there must be a cause for nothing because it appears contradictory.
Spinoza's second form:
1. Something necessarily exists.
2. This necessary existence is either finite or infinite.
3. It is possible for this necessary existence to be infinite.
4. There must be a cause as to why this is not an infinite existence.
5. No finite existence can hinder this being (an infinite existence).
6. Therefore, this must be an infinite existence
Spinoza's arguments borrow from the premise that something exists from the cosmological argument.
Spinoza's God is not the theistic God of Leibniz or Anselm, it is a pantheistic God.
The Objections of Hume and Kant
Hume's Objection:
1. Nothing is rationally demonstrable unless the contrary implies a contradictory
2. Nothing that is distinctly conceivable implies a contradiction
3. Whatever we conceive to exist we can conceive as nonexistent
4. There is no being whose existence implies a contradiction
5. Therefore, there is no being whose existence is rationally demonstrable.
Hume argues that no argument for God is rationally inescapable because it always contains premises that are logically deniable.
Kant's critique of the Ontological proof
Kant objected to the fact that we have no positive concept of a necessary Being (that which cannot be).
He also contended that necessity applied only to propositions, not existence.
Also, what is logically possible is not always ontologically possible.
Existence (Kant held) is not a predicate of a thing. It is not a perfection.
Supposed Causes of the Ontological Mistake
Opponents of the Ontological argument have blamed many sources of the ontological 'mistake'
1) Platonic Philosophy - Platonic epistemology holds that one can directly and intuitively know essences.
2) Metaphysical thinking - some argue that "is" or "exists" is only logical, not ontological.
3) Confusion of cause and reason - Causes need something outside of itself where a reason can be itself (Schopenhauer)
4) Use of a proper name - the use of a proper name implies existence (Russell)
5) The use of the English conditional. Alvin Plantinga claimed that "If Jones is a bachelor, then he is necessarily not married" does not imply "Jones is a bachelor". There may be no Jones. Likewise, "If God exists, then he Necessarily exists" does not imply "God exists" There may be no God at all.
Linehan - Unfair analogy!
"IF Jones is a bachelor, then he is necessarily not married" may not imply "Jones is a bachelor". There may be no Jones. But there is a bachelor. Likewise, "If God exists, then he necessarily exists" may not imply "God exists" But, there is a necessary existence which must be filled by a necessary Existent, which is God.
Findlay's Ontological Disproof of God.
The ontological argument has been widely rejected in modern times.
J. N. Findlay used the ontological proof against itself:
1. God must be thought of as a necessary Being, for anything else short of this would be unworthy of worship.
2. But existential necessary propositions cannot be true for necessity is merely a logical characteristic of propositions, not of reality.
3. Therefore, God cannot exist.
A simpler, proper form of this argument:
1. The only way a necessary Being could exist is to exist necessarily.
2. The proposition "God exists necessarily" is an existentially necessary proposition.
3. No existentially necessary propositions can be true.
4. Therefore, the proposition "God exists necessarily" cannot be true.
A theist can object to this in 4 ways:
1. Change the proposition "God exists necessarily" to "God exists". Then holding the proposition "God exists" as a logically necessary proposition to hold.
2. Deny that necessity applied to existential propositions makes them untrue. (Existentially necessary propositions can be true). Examples of existentially necessary propositions: "I am I". "There is an infinite number of prime numbers". "Square circles do not exist".
3. "God necessarily exists" is a special case (Anselm and Descartes).
4. Findlay's statement "there are no existentially necessary propositions" is an existentially necessary proposition.
Hartshorne's Restatement of the Ontological Proof.
Charles Hartshorne is one of the most ardent defenders of the ontological argument and states it like this:
1. The existence of a necessary being is either:
a) Impossible, and there is no example of it
b) Possible, but there is no example of it
c) Possible, and there is an example of it
2. Possible, but there is no example of it is meaningless because a necessary Being cannot be a possible being.
3. Impossible, and there is no example of it is not eliminated by the ontological argument, but the meaningfulness of the term 'necessary Being' is a justifiable assumption that may be defeated on other grounds.
Hartshorne's Argument:
1. All thought must refer to something beyond itself which is at least possible
2. The necessary existence of a necessary Being is at least possible.
3. With a necessary Being an "at-least-possible" existence is indistinguishable from a "possible and actual" existence. A necessary Being cannot have a "merely possible" existence.
4. Therefore, a necessary Being necessarily has both a possible and an actual existence.
Hartshorne's view of God is neither theistic and pantheistic. It is panentheistic.
Hartshorne states, "Either God is a meaningless term or there exists a divine Being" (141).
All versions of the ontological argument contain the implicit premise that what is rationally inescapable is the real.
Malcolm's restatement of the ontological proof
Malcolm believes that Kant invalidated Anselm's first form, but the second form is immune to all criticism.
Malcolm's restatement of Anselm's 2nd form:
1. The existence of a necessary being must be either:
a) a necessary existence
b) an impossible existence
c) a possible existence
2. The existence of a necessary Being is not an impossible existence
a) No one has ever shown the concept of a necessary being to be contradictory
b) there is a basis in human experience for "a greater than which cannot be thought"
c) Leibniz's attempt to prove that there is no contradiction fails. We cannot show that there cannot be one.
3. The existence of a necessary Being cannot be a possible being because:
a) it is contradictory to the very nature of a necessary being
b) a possible being is dependent, a necessary Being is independent
4. Therefore, A necessary Being Necessarily exists
Plantinga's Critique of the Ontological Argument
Plantinga argues that God could exist without his existence being a necessary one. His existence could be logically contingent but not ontologically so.
Planting states that it is logically possible that God never existed at all. It is logically possible that nothing ever existent including God.
All that proponents of the ontological argument have to do invalidate Plantinga's objections too.
Planting offers an ontological argument that is very cosmological. It has left the a priori realm and moved into the a posteriori realm.
Planting uses modal logic in his argument:
1. The property "has maximal greatness" entails the property "has maximal excellence in every possible world"
2. Maximal excellence entails omniscience, omnipotence, and moral perfection.
3. Maximal greatness is possibly exemplified.
4. There is a world "W" and an essence "E" such that "E" is exemplified in "W" and "E" entails the property "has maximal greatness in W"
5. For any object X, if X, exemplifies E then X exemplifies the property "has maximal excellence in every possible world".
6. E entails the property "has maximal excellence in every possible world".
7. If W had been actual, it would be impossible that E fail to be exemplified.
8. What is impossible does not vary from world to world.
9. There exists a being that has maximal excellence in every world.
10 Therefore, the being that has maximal excellence exists in the actual world.
Plantinga's argument is tight and compelling. It avoids many of the traditional criticism of the ontological argument. However there are a few criticisms:
1. The use of modal logic assumes existence of an actual world. Thus, it is a posteriori, not a priori.
2. Defining a perfect being in theistic terms is gratuitous.
3. The essence E is supposed by Plantinga to havre a real existence.
The ontological argument to be valid must assume that something exists and thus it rests on a cosmological principle.
The ontological argument has not proven God exists by itself. It has in fact yielded four types of God and a possible atheistic conception:
1. Leibniz & Descartes - theistic God
2. Spinoza - pantheistic God
3. Hartshorne - panentheistic God
4. Henle - polytheistic gods
5. Atheism - the universe is necessary, but does not include God
No comments:
Post a Comment