"You're going to meet a good many stray fools in the course of business every day without going out to hunt up the main herd after dark".
"You'll find that education's about the only thing lying around loose in this world, and that it's about the only thing a fellow can have as much of as he's willing to haul away. Everything else is screwed down tight and the screw-driver lost."
One of my favourite books: Letters from A Self-Made Merchant To His Son Being the Letters written by John Graham, Head of the House of Graham & Company, Pork-Packers in Chicago, to his Son, Pierrepont
See also, Lord Chesterfield's Letters to his Son on Becoming a Gentleman
