Luther was preaching on 1 Peter 3:8-15,
“Tenderhearted, humbleminded” [friendly]. Here Peter has in mind mankind in general—friends and enemies, Christians and persecutors. Owing to original sin, man is naturally disposed to seek revenge, especially upon those who injure him without cause. If he can do no more, he at least maliciously invokes evil upon his enemy and rejoices in his misfortune. Now, Christians more than any others in this world are
innocently persecuted, injured, oppressed and aggrieved, even by those having the name and honor of Christians, a thing of frequent occurrence today. God’s people are aggrieved by such treatment, and if the natural instinct of flesh and blood could have its way, they would gladly revenge themselves; just as they of the world mutually exercise their revenge, not content until passion is cooled. 17. But a Christian should not, and indeed consistently he cannot, be unmerciful and vindictive, for he has become a child of God, whose mercy he has accepted and therein continues to live. He cannot seek pleasure in injury to his neighbor orenjoy his misfortune. He cannot maintain a bitter or hard and stubborn heart toward
him. Rather he is disposed to show mercy even to his hostile neighbor, and to pity his blindness and misery; for he recognizes that neighbor as under God’s wrath and hastening to everlasting ruin and condemnation. Thus the Christian is already more than revenged on his enemy. Therefore he should be friendly towards the hostile neighbor and do him every kindness he will permit, in an effort to lead him to
repentance.
