A man only learns by two ...

A man only learns by two things; one is reading and the other is association with smarter people.
A man only learns by two things; one is reading and the other is association with smarter people.

More phrases

If a man watches three football games in a row, he should be declared legally dead.
The truth is not for all men, but only for those who seek it.
A man must be big enough to admit his mistakes, smart enough to profit from them, and strong enough to correct them.
Each man has his own vocation; his talent is his call. There is one direction in which all space is open to him.
The superior man is modest in his speech but exceeds in his actions.

Quotes from the same author

Good judgment comes from experience, and a lot of that comes from bad judgment.
If you find yourself in a hole, the first thing to do is stop digging.
Even if you're on the right track, you'll get run over if you just sit there.
You've got to go out on a limb sometimes because that's where the fruit is.
Mothers are the only race of people that speak the same tongue. A mother in Manchuria could converse with a mother in Nebraska and never miss a word.