When we hit failure, I start to laugh. It’s almost like checking off a box – great,  we got that out of the way. Now we’re that much closer.

– Mick Ebeling

And:

Failure is, in a sense, the highway to success, inasmuch as every discovery of what is false leads us to seek earnestly after what is true.

– John Keats

Both from page 201 of A More Beautiful Question, by Warren Berger. I just finished it and cannot recommend it highly enough.