Untested faith may be true faith, but it is sure to be small faith, and it is likely to remain little as long as it is without trials. Faith never prospers so well as when all things are against her: Tempests are her trainers, and bolts of lightning are her illuminators.

You could not have believed your own weakness if you had not been compelled to pass through the rivers; and you would never have known God’s strength if you had not been supported in the flood. Faith increases in quality, assurance, and intensity the more it is exercised with tribulation. Faith is precious, and its trial is precious too.  Pastor Charles Haddon Spurgeon (1834-1892)

"In this you greatly rejoice, though now for a little while, if need be, you have been grieved by various trials, that the genuineness of your faith, being much more precious than gold that perishes, though it is tested by fire, may be found to praise, honor, and glory at the revelation of Jesus Christ." 1 Peter1:6-7