Whether discord is a sin?

❌ Objection 1 : It would seem that discord is not a sin. For to disaccord with man is to sever oneself from another's will. But this does not seem to be a sin, because God's will alone, and not our neighbor's, is the rule of our own will. Therefore discord is not a sin.

❌ Objection 2 : Further, whoever induces another to sin, sins also himself. But it appears not to be a sin to incite others to discord, for it is written (Acts 23:6) that Paul, knowing that the one part were Sadducees, and the other Pharisees, cried out in the council: "Men brethren, I am a Pharisee, the son of Pharisees, concerning the hope and resurrection of the dead I am called in question. And when he had so said, there arose a dissension between the Pharisees and the Sadducees." Therefore discord is not a sin.

❌ Objection 3 : Further, sin, especially mortal sin, is not to be found in a holy man. But discord is to be found even among holy men, for it is written (Acts 15:39): "There arose a dissension" between Paul and Barnabas, "so that they departed one from another." Therefore discord is not a sin. and least of all a mortal sin.