Whether whoever does an injustice sins mortally?

❌ Objection 1 : It would seem that not everyone who does an injustice sins mortally. For venial sin is opposed to mortal sin. Now it is sometimes a venial sin to do an injury: for the Philosopher says (Ethic. v, 8) in reference to those who act unjustly: "Whatever they do not merely in ignorance but through ignorance is a venial matter." Therefore not everyone that does an injustice sins mortally.

❌ Objection 2 : Further, he who does an injustice in a small matter, departs but slightly from the mean. Now this seems to be insignificant and should be accounted among the least of evils, as the Philosopher declares (Ethic. ii, 9). Therefore not everyone that does an injustice sins mortally.

❌ Objection 3 : Further, charity is the "mother of all the virtues" [*Peter Lombard, Sent. iii, D. 23], and it is through being contrary thereto that a sin is called mortal. But not all the sins contrary to the other virtues are mortal. Therefore neither is it always a mortal sin to do an injustice.