Summa Theologica

OF VICE AND SIN CONSIDERED IN THEMSELVES (SIX ARTICLES)

We have in the next place to consider vice and sin: about which six points have to be considered: (1) Vice and sin considered in themselves; (2) their distinction; (3) their comparison with one another; (4) the subject of sin; (5) the cause of sin; (6) the effect of sin.

Under the first head there are six points of inquiry:

(1) Whether vice is contrary to virtue?

(2) Whether vice is contrary to nature?

(3) Which is worse, a vice or a vicious act?

(4) Whether a vicious act is compatible with virtue?

(5) Whether every sin includes action?

(6) Of the definition of sin proposed by Augustine (Contra Faust. xxii): "Sin is a word, deed, or desire against the eternal law."