It may be better to be a live jackal than a dead lion, but it is better still to be a live lion. And usually easier.

Belief gets in the way of learning.

If a grasshopper tries to fight a lawnmower, one may admire his courage but not his judgement.

Death is the lot of us all, and the only way that the human race has ever conquered death is by treating it with contempt. By living every golden minute as if one had all Eternity.

First you must learn to control your self. The rest follows. Blessed is he who knows himself and commands himself, for the world is his and love and happiness and peace walk with him wherever he goes.

I believe in the honest craft of workmen.

It was equally imperative that this chain of reactions should always tend to dampen, to die out. It must not build up, or the uranium mass would explode within a time interval too short to be measured by any means whatsoever. Nor would there be anyone left to measure it.