Now, it may surprise you to learn that in His efforts to get permanent possession of a soul, [God] relies on the troughs even more than on the peaks; some of His special favorites have gone through longer and deeper troughs than anyone else... It is during such trough periods, much more than during the peak periods, that it is growing into the sort of creature He wants it to be... He wants them to learn to walk and must therefore take away His hand; and if only the will to walk is really there He is pleased even with their stumbles.
C.S. Lewis, The Screwtape Letters
effort, growth, improvement, struggles, trials