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Ideas from 'The Realm of Matter' by George Santayana [1930], by Theme Structure

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7. Existence / A. Nature of Existence / 6. Criterion for Existence
18521 The criterion of existence is the possibility of action
                        Full Idea: The possibility of action ...is the criterion of existence, and the test of substantiality.
                        From: George Santayana (The Realm of Matter [1930], p.107), quoted by John Heil - The Universe as We Find It
                        A reaction: I rather like this. I think I would say the power is the criterion of existence.