The great question is not whether you have failed, but whether you are content with failure.
Develop success from failures. Discouragement and failure are two of the surest stepping stones to success.
Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes.
FAILURE, FAILURE IS INTRUCTIVE
If you're not failing every now and again, it's a sign you're not doing anything very innovative.
Failure is simply a few errors in judgment, repeated every day.
FAILURE, FEW ERRORS IN JUDGEMENT