Whether theft is a mortal sin?

❌ Objection 1 : It would seem that theft is not a mortal sin. For it is written (Prov. 6:30): "The fault is not so great when a man hath stolen." But every mortal sin is a great fault. Therefore theft is not a mortal sin.

❌ Objection 2 : Further, mortal sin deserves to be punished with death. But in the Law theft is punished not by death but by indemnity, according to Ex. 22:1, "If any man steal an ox or a sheep . . . he shall restore have oxen for one ox, and four sheep for one sheep." Therefore theft is not a mortal sin.

❌ Objection 3 : Further, theft can be committed in small even as in great things. But it seems unreasonable for a man to be punished with eternal death for the theft of a small thing such as a needle or a quill. Therefore theft is not a mortal sin.