If it were left entirely to the hands of people, even the best of people, what assurance could there be that anyone could be saved? Did not Adam fall? Did not holy angels fall? Have not some of the best of men fallen into sin? And who has such a strength of holiness that he could certainly confide in it to make his own salvation sure? Any man must know little of himself, and of the human heart, who supposes that he has such a strength of virtue that he would never fall away if left to himself. But if this be so, then his only hope of salvation is in the fact that God intends to "keep his people by his own power through faith unto salvation."

1 Peter 3-5
3 Praise be to the God and Father of our Lord Jesus Christ! In his great mercy he has given us new birth into a living hope through the resurrection of Jesus Christ from the dead, 4 and into an inheritance that can never perish, spoil or fade. This inheritance is kept in heaven for you, 5 who through faith are shielded by God’s power until the coming of the salvation that is ready to be revealed in the last time.