The advantage of the emotions is that they lead us astray:

I always like to know everything about my new friends, and nothing about my old ones.

Nowadays most people die of a sort of creeping common sense, and discover when it is too late that the only things one never regrets are one's mistakes.

Examinations, sir, are pure humbug from beginning to end. If a man is a gentleman, he knows quite enough, and if he is not a gentleman, whatever he knows is ba…

Where we have strong emotions, we're liable to fool ourselves. (From the 'Cosmos' television series, 'Blues for the Red Planet')

Hearken with your ears to these best counsels, Reflect upon them with illumined judgment. Let each one choose his creed with that freedom of choice each must h…

Don't try to solve serious matters in the middle of the night.