When all smiles upon you, you may think there is no need to talk of such a thing as separation from the love of Christ; but if persecution were to come, and you were to be led forth to the fire, you would feel that that love of Christ is a VERY PRECIOUS thing.
The suffering of sickness and the suffering of persecution have this in common: they are both intended by Satan for the destruction of our faith, and governed by God for the purifying of our faith... Christ sovereignly accomplishes His loving, purifying purpose, by overruling Satan's destructive attempts. Satan is always aiming to destroy our faith; but Christ magnifies His power in weakness.
Author: John Piper Source: Desiring God, 1996, p. 216
If we suffer persecution and affliction in a right manner, we attain a larger measure of conformity to Christ, by a due improvement of one of these occasions, than we could have done merely by imitating his mercy, in abundance of good works.