When the faithful see that it is well with the wicked, they are necessarily tempted to be envious; and this is a very dangerous trial; for present happiness is
what all desire. Hence the Spirit of God carefully dwells on this, in many places, as well as in the thirty-seventh Psalm, lest the faithful should envy the prosperity of the ungodly. The same is what Peter speaks of, for he shews that afflictions ought to be calmly borne by the children of God, when they compare the lot of others with their own. But he takes it as granted that God is the judge of the world, and that, therefore, no one can escape his hand with impunity. He hence infers, that a dreadful vengeance will soon overtake those whose condition seems now favorable. The design of what he says, as I have already stated, is to shew that the children of God should not faint under the bitterness of present evils, but that they ought, on the contrary, calmly to bear their afflictions for a short time, as the issue will be salvation, while the ungodly will have to exchange a fading and fleeting prosperity for eternal perdition.
But the argument is from the less to the greater; for if God spares not his own children whom he loves and who obey him, how dreadful will be his severity against enemies and such as are rebellious! There is, then, nothing better than to obey the Gospel, so that God may kindly correct us by his paternal hand for our salvation.
He draws this conclusion, that persecutions ought to be submissively endured, for the condition of the godly in them is much happier than that of the unbelieving, who enjoy prosperity to their utmost wishes. He, however, reminds us that we suffer nothing except according to the permission of God, which tends much to comfort us; when he says, Let them commit themselves to God, it is the same as though he had said, “Let them deliver themselves and their life to the safe keeping of God.” And he calls him afaithful possessor, because he faithfully keeps and defends whatever is under his protection or power. Some render the word “Creator;” and the term κτίστης means both; but the former meaning I prefer, for by bidding us to deposit our life with God, he makes him its safe keeper. He adds, in well-doing, lest the faithful should retaliate the wrongs done to them, but that they might on the contrary contend with the ungodly, who injured them, by well-doing.
From his commentary on 1 Peter 4:17-19
what all desire. Hence the Spirit of God carefully dwells on this, in many places, as well as in the thirty-seventh Psalm, lest the faithful should envy the prosperity of the ungodly. The same is what Peter speaks of, for he shews that afflictions ought to be calmly borne by the children of God, when they compare the lot of others with their own. But he takes it as granted that God is the judge of the world, and that, therefore, no one can escape his hand with impunity. He hence infers, that a dreadful vengeance will soon overtake those whose condition seems now favorable. The design of what he says, as I have already stated, is to shew that the children of God should not faint under the bitterness of present evils, but that they ought, on the contrary, calmly to bear their afflictions for a short time, as the issue will be salvation, while the ungodly will have to exchange a fading and fleeting prosperity for eternal perdition.
From John Calvin’s Commentary on 
