“The wisest mind has something yet to learn.”
“The wisest mind hath something yet to learn.”
“The wisest man has something yet to learn.”
“So it is that there is nothing to be taught, but yet there is something to be learned.”
“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 wisest man I ever knew taught me something I never forgot. And although I never forgot it, I never quite memorized it either. So what I’m left with is the memory of having learned something very wise that I can’t quite remember.”