My great concern is not whether you have failed, but whether you are content with your failure.
       - Abraham Lincoln.

It's okay to mourn your failure, but never ever give up

You're on the road to success when you realize that failure is only a detour.
       - Anonymous

Failure is not a single, cataclysmic event. You don't fail overnight. Instead, failure is a few errors in judgment, repeated every day.
       - Jim Rohn

Make failure your teacher, not your undertaker.
       - Zig Ziglar

I am not discouraged, because every wrong attempt discarded is another step forward.
       - Thomas A. Edison

You haven't failed until you quit trying.
       - Anonymous

Success is the proper utilization of failure.
       - Anonymous