Thinking is associated rather with repose. This Aristotle himself teaches in Book VII of the Physics, where he says that if a man is to become wise he must first achieve an inward tranquility; which is why the young and the restless are not, as a rule, wise. Wisdom and prudence are acquired, says Aristotle, by one who is content to sit down and be quiet.
--St. Thomas Aquinas, Commentary on Aristotle’s De Anima, I, lect. VIII, 125.
