One way to learn to do something right is to do something wrong. Failure must teach us, or surely success will not reward us.
I've had a lot of practice and wrong's what I do best.
Age doesn't always bring wisdom. Sometimes age comes alone.
After you make a fool of yourself a few hundred times, you learn what works.
Wise men learn by others' harms, fools scarcely by their own.
Granny sighed. "You have learned something," she said, and thought it safe to insert a touch of sternness into her voice. "They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance.
Success is a poor teacher
I have learned all kinds of things from my many mistakes. The one thing I never learn to stop making them.
The best lessons a man ever learns are from his mistakes. It is not for want of schoolmasters that we are still ignorant.
The only road to doing good shows, is doing bad shows.
Even a fool learns something once it hits him.
He is happy in his wisdom who has learned at another's expense.
You live and you learn.
