What we cannot think we cannot think, therefore we also cannot say what we cannot think.

There seems scarcely any limit to what could be done in the way of producing a good world, if only men would use science wisely.

I must, before I die, find some way to say the essential thing that is in me, that I have never said yet -- a thing that is not love or hate or pity or scorn, but the very breath of life, fierce and coming from far away, bringing into human life the vastness and the fearful passionless force of non-human things.

All the time that he can spare from the adornment of his person, he devotes to the neglect of his duties.

Scientific societies are as yet in their infancy. It is to be expected that advances in physiology and psychology will give governments much more control over individual mentality than they now have even in totalitarian countries. Fitche laid it down that education should aim at destroying free will, so that, after pupils have left school, they shall be incapable, throughout the rest of their lives, of thinking or acting otherwise than as their schoolmasters would have wished.

Both in thought and in feeling, even though time be real, to realise the unimportance of time is the gate of wisdom.

You may reasonably expect a man to walk a tightrope safely for ten minutes; it would be unreasonable to do so without accident for two hundred years.