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If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

"Success is great, but success with humility is even better."

Despair is the price one pays for self-awareness.

The difference between a moral man and a man of honor is that the latter regrets a discreditable act even when it has worked.