Summa Theologica by St. Thomas Aquinas
FS: Treatise On Habits In Particular
Q[71] Of Vice And Sin Considered In Themselves
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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:

A[1] Whether vice is contrary to virtue?

A[2] Whether vice is contrary to nature?

A[3] Which is worse, a vice or a vicious act?

A[4] Whether a vicious act is compatible with virtue?

A[5] Whether every sin includes action?

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