Man ... can go up against gravitation in a balloon, and why should he not hope that ultimately he may be able to stop or accelerate his drift along the Time-Dimension, or even turn about and travel the other way.

I believe that now and always the conscious selection of the best for reproduction will be impossible; that to propose it is to display a fundamental misunderstanding of what individuality implies. The way of nature has always been to slay the hindmost, and there is still no other way, unless we can prevent those who would become the hindmost being born. It is in the sterilization of failure, and not in the selection of successes for breeding, that the possibility of an improvement of the human stock lies.

...fact takes no heed of human hopes.

Strength is the outcome of need; security sets a premium on feebleness.

Only people who are well off can be - complex.

Nature never appeals to intelligence until habit and instinct are useless. There is no intelligence where there is no need of change.

Leaders should lead as far as they can and then vanish. Their ashes should not choke the fire they have lit.