Failure is tolerable and even desirable ... so long as you are learning. Failure that doesn't develop new learning is truly a FAIL, with no redeeming qualities. But failure, that produces lessons for the next try can truly make an organization, school, classroom, student, or teacher smarter and more successful. Liz Wiseman, in her book Multipliers introduces Lutz Ziob who was the general manager of the education business at Microsoft who was described as,

"He brings an intellectual curiosity for why things didn't work out."

We must ask lots of questions about our failures to determine why they didn't work and what we might do differently to reach our goals.

Is that your best?

Liz Wiseman in Multipliers

Asking whether people are giving their best gives them the opportunity to push themselves beyond their previous limits.