Whether omission is a special sin?

❌ Objection 1 : It would seem that omission is not a special sin. For every sin is either original or actual. Now omission is not original sin, for it is not contracted through origin nor is it actual sin, for it may be altogether without act, as stated above (FS, Question [71], Article [5]) when we were treating of sins in general. Therefore omission is not a special sin.

❌ Objection 2 : Further, every sin is voluntary. Now omission sometimes is not voluntary but necessary, as when a woman is violated after taking a vow of virginity, or when one lose that which one is under an obligation to restore, or when a priest is bound to say Mass, and is prevented from doing so. Therefore omission is not always a sin.

❌ Objection 3 : Further, it is possible to fix the time when any special sin begins. But this is not possible in the case of omission, since one is not altered by not doing a thing, no matter when the omission occurs, and yet the omission is not always sinful. Therefore omission is not a special sin.

❌ Objection 4 : Further, every special sin is opposed to a special virtue. But it is not possible to assign any special virtue to which omission is opposed, both because the good of any virtue can be omitted, and because justice to which it would seem more particularly opposed, always requires an act, even in declining from evil, as stated above (Article [1], ad 2), while omission may be altogether without act. Therefore omission is not a special sin.