Chapter 58

The act of the one had and of the one having, as that of the arms and the armed or that of the wearer and the worn, is called a habit. In the second place, habits are adventitious acts which are stable, whether physical or spiritual. Such would be physical, as heat in heated things, or spiritual, as knowledge. Thirdly, habit is that which one does not yet have, but for having which one does have a suitability. And this is the first meaning of being in potency. Fourthly, there is the natural quality or habit, as the heat of the fire and the dream of the sleeper. And this is the second meaning