Augustine of Hippo
Catena Aurea · Johannesevangelium 21
So when they had dined, Jesus saith to Simon Peter, Simon, son of Jonas, lovest thou me more than these? He saith unto him, Yea, Lord; thou knowest that I love thee. He saith unto him, Feed my lambs. He saith to him again the second time, Simon, son of Jonas, lovest thou me? He saith unto him, Yea, Lord; thou knowest that I love thee. He saith unto him, Feed my sheep. He saith unto him the third time, Simon, son of Jonas, lovest thou me? Peter was grieved because he said unto him the third time, Lovest thou me? And he said unto him, Lord, thou knowest all things; thou knowest that I love thee. Jesus saith unto him, Feed my sheep. He saith to him again the second time, Simon, son of Jonas, lovest thou Me? He saith unto Him, Yea, Lord; Thou knowest that I love Thee.
(Tract. cxxii) Well doth He say to Peter, Lovest thou Me (ἀγαπᾶς diligis), and Peter answer, Amo Te (φελῶ amo), and our Lord replies again, Feed My lambs. Whereby, it appears that amor and dilectio are the same thing: especially as our Lord the third time He speaks does not say, Diligis Me, but Amas Me. He saith unto him the third time, Simon, son of Jonas, lovest thou Me? A third time our Lord asks Peter whether he loves Him. Three confessions are made to answer to the three denials; that the tongue might shew as much love as it had fear, and life gained draw out the voice as much as death threatened.