John Stott, in The Cross of Christ, first cites this remarkable statement of Paul Tournier's:
"One could also say that it is not suffering which makes a person grow, but that one does not grow without suffering."
Stott goes on to say,
"There is always an indefinable something about people who have suffered. They have a fragrance which others lack. They exhibit the meekness and gentleness of Christ. One of the most remarkable statements Peter makes in his first letter is that 'he who has suffered in his body is done with sin' (4:1). Physical affliction, he seems to be saying, actually has the effect of making us stop sinning."