“When one teaches, two learn.”
“...No one teaches well unless he has first learned well; no one learns well unless he learns in order to teach. And both learning and teaching are vain and unprofitable unless accompanied by practice.”
“When you learn, teach, when you get, give.”
“No one learns as much about a subject as one who is forced to teach it.”
“The master is not the one who teaches; it's the one who suddenly learns.”
“Leaders are more powerful role models when they learn than when they teach.”