to be rightly exercised by troubles

"Men of strong faith, who make a proper use of the very varied Scriptures God has given us, will not be purged out from the commonwealth of Israel by tribulation. Though they may not understand why certain troubles come, they will determine to be rightly exercised by them, in order that, like Job, they may come out of the furnace of affliction like silver refined. It may seem that their abilities are fettered, but they remember that God knows all the circumstances, and He will be just. They will continue the work of building even though the enemy presses so hard that they only have one hand wherewith to labour; their troubles will become their tutors, and disappointment--to borrow a fine idea from Henry Kirke White--will be like a gentle nurse to wean them from the world."