Summa Theologica by St. Thomas Aquinas
FS: Treatise On Habits
Q[51] Of The Cause Of Habits, As To Their Formation
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We must next consider the cause of habits: and firstly, as to their formation; secondly, as to their increase; thirdly, as to their diminution and corruption. Under the first head there are four points of inquiry:

A[1] Whether any habit is from nature?

A[2] Whether any habit is caused by acts?

A[3] Whether any habit can be caused by one act?

A[4] Whether any habits are infused in man by God?