Charles H. Spurgeon on Psalms 66:10

Thou, O God, hast proved us. It is not known what corn will yield, till it come to the flail; nor what grapes, till they come to the press. Grace is hid in nature, as sweet water in rose leaves; the fire of affliction fetcheth it out. —Thou hast tried us as silver. The wicked also are tried (Re 3:10), but they prove reprobate silver (Jer 6:28), or at best, as alchemy gold, that will not bear the seventh fire, as Job did (Job 23:10). John Trapp.