Remind yourself, in the darkest moments, that every failure is only a step toward success.
— Og Mandino

Often the doorway of success is entered through the hallway of failure.
— Erwin Lutzer

Even if your goal is never reached, it is a learning process that will enhance your life.
— Walter Payton

If you want to triple your success ratio, you have to triple your failure rate.
— Harvey Mackay

Besides the practical knowledge which defeat offers, there are important personality profits to be taken. Defeat strips away false values and makes you realize what you really want. It stops you from chasing butterflies and puts you to work digging gold.
— William Marston