Persevere in thy quest and thou shalt find what thou seekest. Pursue thy aim unswervingly and thou shalt gain victory. Struggle earnestly and thou shalt triumph.
I believe in a business boarding up early. If you make a mistake, you put the boards in the window of the store and say, "Hey, I made a mistake." Let me take two shots in the arm and a punch on the nose and let me get on to the next thing. I don't believe in worrying over failures. I worry about successes. This is opposite from most people. Most people zero in on their failures. I try to keep all my attention on a pyramid type philosophy rather than the averaging-down philosophy.
Criticism may not be agreeable, but it is necessary. It fulfils the same function as pain in the human body. It calls attention to an unhealthy state of things.