And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
John 10:28

There is nothing uncertain about my acceptance with God, nor about my forgiveness, nor about my sonship. When I realize that I have been brought into God’s plan, I know that nothing can frustrate this.

Do you know why the Pilgrim Fathers made the attempt and succeeded in crossing the Atlantic? What was it that enabled men to do things like that and to do things that were even more hazardous? It was that they believed in what is called “the doctrine of the perseverance of the saints”; it was because they had seen themselves in the plan of God that cannot be broken and that cannot fail. It is as absolute as God Himself; He knows the end as well as the beginning. “Neither shall any man, “ said Christ, “pluck them out of my hand.” It is unthinkable.
~Martyn Lloyd-Jones