Nothing is as easy to make as a promise this winter to do something next summer; this is how commencement speakers are caught.

We evaluate others with a Godlike justice, but we want them to evaluate us with a Godlike compassion.

Ignorance per se is not nearly as dangerous as ignorance of ignorance.

A winner knows how much he still has to learn, even when he is considered an expert by others; a loser wants to be considered an expert by others before he has learned enough to know how little he knows.

Much as a teacher may wince at the thought, he is also an entertainer—for unless he can hold his audience, he cannot really instruct or edify them.

The pessimist sees only the tunnel; the optimist sees the light at the end of the tunnel; the realist sees the tunnel and the light - and the next tunnel.

Middle Age is that perplexing time of life when we hear two voices calling us, one saying, 'Why not?' and the other, 'Why bother?'