Philocrities flags up JK Rowling's "commencement address" on the "benefits of failure" at Harvard.
Failure gave me an inner security that I had never attained by passing examinations. Failure taught me things about myself that I could have learned no other way. I discovered that I had a strong will, and more discipline than I had suspected; I also found out that I had friends whose value was truly above rubies.
I like this from Churchill:
Success is not final, failure is not fatal: it is the courage to continue that counts.