"Успех не бесконечен, поражение не фатально, значение имеет лишь мужество продолжать."
Some quotes I like:
"Success is not final, failure is not fatal, it is the courage to continue that counts."
"Criticism may not be agreeable, but it is necessary. It fulfills the same function as pain in the human body. It calls attention to an unhealthy state of things."
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
"You have enemies. Good. That means you've stood up for something, sometime in your life."