A.w. Tozer said this quote

It is doubtful whether God can bless a man greatly until he has hurt him deeply. God actually rises up storms of conflict in relationships at times in order to accomplish that deeper work in our character. We cannot love our enemies in our own strength. This is graduate-level grace. Are you willing to enter this school? Are you willing to take the test? If you pass, you can expect to be elevated to a new level in the Kingdom. For He brings us through these tests as preparation for greater use in the Kingdom. You must pass the test first.