And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we are. John 17: 11.
If this be so, that Christ so eminently discovered his care and love for his people, in this his parting hour; then hence we conclude, The perseverance of the saints is unquestionable. Do you hear how he pleads! how he begs! how he fills his mouth with arguments! how he chooses his words, and sets them in order, how he winds up his spirit to the very highest pitch of zeal and fervency? and can you doubt of success? Can such a Father deny the importunity, and strong seasonings and pleading of such a Son; O, it can never be! he cannot deny him: Christ has the art and skill of prevailing with God: He has (as in this appears) the tongue of the learned. If the heart or hand of God were hard to be opened, yet this would open them; but when the Father himself loves us, and is inclined to do us good, who can doubt of Christ’s success? “That which is in motion, is the more easily moved” The cause Christ manages in heaven for us is just and righteous. The manner in which he pleads is powerful and therefore the success of his suit is unquestionable.
The apostle professes,“We can do nothing against the truth.” He means it in regard of the bent of his heart; he could not move against truth and righteousness. And if a holy man cannot, much less will a holy God. If Christ undertake to plead the cause of his people with the Father, and use his oratory with him, there is no doubt of his prevailing. Every word in this prayer is a chosen shaft, drawn to the head by a strong and skilful hand; you need not question but it goes home to the white, and hits the mark aimed at. Does he pray, “Father, keep, through thine own name, those thou hast given me?” Sure they shall be kept, if all the power in heaven can keep them. Think on this, when dangers surround your souls or bodies, when fears and doubts are multiplied within: when thou art ready to say in thy haste, All men are liars, I shall one day perish by the hand of sin or Satan; think on that encouragement Christ gave to Peter, “I have prayed for thee.”
from The Fountain of Life Opened by John Flavel