An individual human existence should be like a river

I conclude that, while it is true that science cannot decide questions of value, that is because they cannot be intellectually decided at all, and lie outside the realm of truth and falsehood. Whatever knowledge is attainable, must be attained by scientific methods; and what science cannot discover, mankind cannot know.

All that passes for knowledge can be arranged in a hierarchy of degrees of certainty, with arithmetic and the facts of perception at the top.

The fundamental defect of fathers, in our competitive society, is that they want their children to be a credit to them.

I used, when I was younger, to take my holidays walking. I would cover 25 miles a day, and when the evening came I had no need of anything to keep me from boredom, since the delight of sitting amply sufficed.

Zeno was concerned with three problems... These are the problem of the infinitesimal, the infinite, and continuity.

The very best proof that something can be done is that someone has already done it.