“Smart people learn from their mistakes. But the real sharp ones learn from the mistakes of others.”
“A smart person learns from his mistakes, but a truly wise person learns from the mistakes of others.”
“It's said that a wise person learns from his mistakes. A wiser one learns from others' mistakes. But the wisest person of all learns from others's successes.”
“The best lessons learned are from other peoples mistakes.”
“Only a fool learns from his own mistakes. The wise man learns from the mistakes of others.”
“The only real mistake is the one from which we learn nothing.”