"When Simon Peter heard that it was the Lord, he girt his fisher's coat unto him (for he was naked), and did cast himself into the sea."[13] His was the warm energy, the forward impulse of young life, the free bold plunge of an impetuous and chivalrous nature into the waters which are nations and peoples. _In_ he _must_; _on_ he _will_. The prophecy which follows the thrice renewed restitution of the fallen Apostle is as follows: "Verily, verily, I say unto thee, When thou wast young, thou girdest thyself, and walkedst whither thou wouldest: but when thou shalt be old, thou shalt stretch forth thy hands, and another shall gird thee, and carry thee whither thou wouldest not. This spake He, signifying by what death He should glorify God, and when He had spoken this, He saith unto him, Follow Me."[14] This, we are told, is obscure; but it is obscure only as to details. To St. Peter it could have conveyed no other impression than that it foretold his martyrdom. "When thou wast young," points to the tract of years up to old age. It has been said that forty is the old age of youth, fifty the youth of old age. But our Lord does not actually define old age by any precise date. He takes what has occurred as a type of Peter's youthfulness of heart and frame--"girding himself," with rapid action, as he had done shortly before; "walking," as he had walked on the white beach of the lake in the early dawn; "whither thou wouldest," as when he had cried with impetuous half defiant independence, "I go a fishing," invited by the auguries of the morning, and of the water. The form of expression seems to indicate that Simon Peter was not to go far into the dark and frozen land; that he was to be growing old, rather than absolutely old.[15] Then should he stretch forth his hands, with the dignified resignation of one who yields manfully to that from which nature would willingly escape. "This spake He," adds the evangelist, "signifying by what death he shall glorify God."[16] What fatal temptation leads so many commentators to minimise such a prediction as this? If the prophecy were the product of a later hand added after the martyrdom of St. Peter, it certainly would have wanted its present inimitable impress of distance and reserve.