“The only thing that is more expensive than education is ignorance.”
“Thinking aloud is a habit which is responsible for most of mankind's misery.”
“There are no fools so troublesome as those that have wit.”
“Fools make feasts and wise men eat them.”
“Wise men don't need advice. Fools won't take it.”
“Experience keeps a dear school, but fools will learn in no other, and scarce in that.”