1 Peter 1:5

5Who are kept by the power of God We are to notice the connection when he says, that we are kept while in the world, and at the same time our inheritance is reserved in heaven; otherwise this thought would immediately creep in, “What does it avail us that our salvation is laid up in heaven, when we are tossed here and there in this world as in a turbulent sea? What can it avail us that our salvation is secured in a quiet harbour, when we are driven to and fro amidst thousand shipwrecks?” The apostle, therefore, anticipates objections of this kind, when he shews, that though we are in the world exposed to dangers, we are yet kept by faith; and that though we are thus nigh to death, we are yet safe under the guardianship of faith. But as faith itself, through the infirmity of the flesh, often quails, we might be always anxious about the morrow, were not the Lord to aid us. (9)

And, indeed, we see that under the Papacy a diabolical opinion prevails, that we ought to doubt our final perseverance, because we are uncertain whether we shall be tomorrow in the same state of grace. But Peter did not thus leave us in suspense; for he testifies that we stand by the power of God, lest any doubt arising from a consciousness of our own infirmity, should disquiet us. How weak soever we may then be, yet our salvation is not uncertain, because it is sustained by God’s power. As, then, we are begotten by faith, so faith itself receives its stability from God’s power. Hence is its security, not only for the present, but also for the future.

Unto salvation As we are by nature impatient of delay, and soon succumb under weariness, he therefore reminds us that salvation is not deferred because it is not yet prepared, but because the time of its revelation is not yet come. This doctrine is intended to nourish and sustain our hope. Moreover, he calls the day of judgment the last time, because the restitution of all things is not to be previously expected, for the intervening time is still in progress. What is elsewhere called the last time, is the whole from the coming of Christ; it is so called from a comparison with the preceding ages. But Peter had a regard to the end of the world.