Ambrose of Milan

Or else, This brother is described so as to be said to come from the farm, that is, engaged in worldly occupations, so ignorant of the things of the Spirit of God, as at last to complain that a kid had never been slain for him. For not for envy, but for the pardon of the world, was the Lamb sacrificed. The envious seeks a kid, the innocent a lamb, to be sacrificed for it. Therefore also is he called the elder, because a man soon grows old through envy. Therefore too he stands without, because his malice excludes him; therefore could he not hear the dancing and music, that is, not the wanton fascinations of the stage, but the harmonious song of a people, resounding with the sweet pleasantness of joy for a sinner saved. For they who seem to themselves righteous are angry when pardon is granted to one confessing his sins. Who art thou that speakest against thy Lord, that he should not, for example, forgive a fault, when thou pardonest whom thou wilt? But we ought to favour forgiving sin after repentance, lest while grudging pardon to another, we ourselves obtain it not from our Lord. Let us not envy those who return from a distant country, seeing that we ourselves also were afar off.