Here are a few that come to mind,
"Pain is just weakness leaving the body; Suck it up and rub some dirt in it"
"The visionary lies to himself, the liar only to others"
-Friedrich Nietzsche
"Great minds discuss ideas, average minds discuss events, and small minds discuss people"
"Delusions of grandeur cause complacency, ten years of experience is not the same as one repeated ten times"
"Learn more from your mistakes than your successes"
"Fool me once, shame on you. Fool me twice, shame on me..."
“Resentment is like drinking poison and then hoping it will kill your enemies.”
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