(1) Whether any habit is from nature?
(2) Whether any habit is caused by acts?
(3) Whether any habit can be caused by one act?
(4) Whether any habits are infused in man by God? ________________________
FIRST ARTICLE [I-II, Q. 51, Art. 1]
Whether Any Habit Is from Nature?
Objection 1: It would seem that no habit is from nature. For the use of those things which are from nature does not depend on the will. But habit "is that which we use when we will," as the Commentator says on De Anima iii. Therefore habit is not from nature.
Obj. 2: Further, nature does not employ two where one is sufficient. But the powers of the soul are from nature. If therefore the habits of the powers were from nature, habit and power would be one.
Obj. 3: Further, nature does not fail in necessaries. But habits are necessary in order to act well, as we have stated above (Q. 49, A. 4). If therefore any habits were from nature, it seems that nature would not fail to cause all necessary habits: but this is clearly false. Therefore habits are not from nature.
On the contrary, In Ethic. vi, 6, among other habits, place is given to understanding of first principles, which habit is from nature: wherefore also first principles are said to be known naturally.