When asked what learning was the most necessary, he said, Not to unlearn what you have learned!
Diogenes LaertiusDiogenes said once to a person who was showing him a dial, "It is a very useful thing to save a man from being too late for supper.
Diogenes LaertiusOne of the sayings of Diogenes was that most men were within a finger's breadth of being mad; for if a man walked with his middle finger pointing out, folks would think him mad, but not so if it were his forefinger.
Diogenes LaertiusA man once asked Diogenes what was the proper time for supper, and he made answer, "If you are a rich man, whenever you please; and if you are a poor man, whenever you can.
Diogenes Laertius