His priority did not seem to be to teach them what he knew, but rather to impress upon them that nothing, not even... knowledge, was foolproof.
Never esteem anything as of advantage to you that will make you break your word or lose your self-respect.
There is only one thing a philosopher can be relied upon to do, and that is to contradict other philosophers.
Who were these clowns?
I daresay one profits more by the mistakes one makes off one's own bat than by doing the right thing on somebody's else advice.
Ask not what you can do for your country. Ask what's for lunch.
We succeed only as we identify in life, or in war, or in anything else, a single overriding objective, and make all other considerations bend to that one objective.