This is one of my favorite quotes I found in The Miracle of Forgiveness:
Strength and struggle go together. The supreme reward of struggle is strength. Life is a battle and the greatest joy is to overcome. The pursuit of easy things makes men weak. Do not equip yourselves with superior power and hope to escape the responsibility and work. It cannot be done. It is following the lines of least resistance that makes rivers and men crooked.
– Ralph Parlette