A clever man commits no minor blunders.
By seeking and blundering we learn.
He who is plenteously provided for from within needs but little from without.
Nothing shows a man's character more than what he laughs at.
I've often heard it said a preacher might learn with a comedian for a teacher.
The safest thing is always to try to convert everything that is in us and around us into action; let the others talk and argue about it as they please.