But how is is that thought (viz., sense, imagination, and thought proper) is sometimes followed by action, sometimes not; sometimes by movement, sometimes not?What happens seems parallel to the case of thinking and inferring about the immovable objects of science. There the end is the truth seen (for, when one conceives the two premises, one at once conceives and comprehends the conclusion), but here the two premises result in a conclusion which is an action…Now that the action is the conclusion is clear. But the premises of action are of two kinds, of the good and of the possible. Aristotle, De Motu Animalium, 701a, 6–10, 23
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