Virtue caused by habituation

Summa Theologica, Part I-II (Pars Prima Secundae) primary

In the Second Article, Aquinas holds that virtuous habits can be caused by habituation when human acts follow human reason, but virtues that direct to the good defined by Divine Law are produced only by divine operation.

body, considered as part of his species, is to be referred, in a way, to the soul, in so far as this particular body is adapted to this particular soul. In both these ways virtue is natural to man inchoatively. This is so in respect of the specific nature, in so far as in man's reason are to be found instilled by nature certain naturally known principles of both knowledge and action, which are the nurseries of intel…