21:15-19 Our Lord addressed Peter by his original name, as if he had forfeited that of Peter through his denying him. He now answered, Thou knowest that I love thee; but without professing to love Jesus more than others. We must not be surprised to have our sincerity called into question, when we ourselves have done that which makes it doubtful. Every remembrance of past sins, even pardoned sins, renews the sorrow of a true penitent. Conscious of integrity, Peter solemnly appealed to Christ, as knowing all things, even the secrets of his heart. It is well when our falls and mistakes make us more humble and watchful. The sincerity of our love to God must be brought to the test; and it behoves us to inquire with earnest, preserving prayer to the heart-searching God, to examine and prove us, whether we are able to stand this test. No one can be qualified to feed the sheep and lambs of Christ, who does not love the good Shepherd more than any earthly advantage or object. It is the great concern of every good man, whatever death he dies, to glorify God in it; for what is our chief end but this, to die to the Lord, at the word of the Lord?

15-17. when they had dined, Jesus saith—Silence appears to have reigned during the meal; unbroken on His part, that by their mute observation of Him they might have their assurance of His identity the more confirmed; and on theirs, from reverential shrinking to speak till He did.

Simon, son of Jonas, lovest thou me more than these?—referring lovingly to those sad words of Peter, shortly before denying his Lord, "Though all men shall be offended because of Thee, yet will I never be offended" (Mt 26:33), and intending by this allusion to bring the whole scene vividly before his mind and put him to shame.

Yea, Lord; thou knowest that I love thee—He adds not, "more than these," but prefixes a touching appeal to the Saviour's own omniscience for the truth of his protestation, which makes it a totally different kind of speech from his former.

He saith unto him, Feed my lambs—It is surely wrong to view this term as a mere diminutive of affection, and as meaning the same thing as "the sheep" [Webster and Wilkinson]. It is much more according to usage to understand by the "lambs," young and tender disciples, whether in age or Christian standing (Isa 40:11; 1Jo 2:12, 13), and by the "sheep" the more mature. Shall we say (with many) that Peter was here reinstated in office? Not exactly, since he was not actually excluded from it. But after such conduct as his, the deep wound which the honor of Christ had received, the stain brought on his office, the damage done to his high standing among his brethren, and even his own comfort, in prospect of the great work before him, required some such renewal of his call and re-establishment of his position as this.