“The surest test of discipline is it's absence.”
“Lucidity of speech is unquestionably one of the surest tests of mental precision...In my experience a confused talker is never a clear thinker.”
“Perhaps the surest test of an individual's integrity is his refusal to do or say anything that would damage his self-respect”
“Program testing can be used to show the presence of bugs, but never to show their absence!”
“To pursue happiness for its own sake is the surest way to lose it.”
“Captivated by its discipline, humanity forgets and goes on forgetting that it is the discipline of chess players, not of angels.”