Augustine of Hippo

For this reason, overseers or rulers are set over the churches to reprimand sin, not to spare it. Nor is a person fully free from blame who is not in authority but who notices in those persons he meets in social life many faults he should censure and admonish. He is blameworthy if he fails to do this out of fear of hurting feelings or of losing such things as he may rightfully enjoy in his life but to which he is unduly attached.

City of God 1.9 ↗