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

I had supposed until that time that it was quite common for parents to love their children, but the war persuaded me that it is a rare exception. I had supposed that most people liked money better than almost anything else, but I discovered that they liked destruction even better. I had supposed that intellectuals frequently loved truth, but I found here again that not ten per cent of them prefer truth to popularity.

We must be sceptical even of our scepticism.

We shall say that we have acquaintance with anything of which we are directly aware, without the intermediary of any process of inference of any knowledge of truths.

Each act of cruelty is eternally a part of the universe; nothing that happens later can make that act good rather than bad, or can confer perfection on the whole of which it is a part.

The key to happiness is accepting one unpleasant reality every day.

If the State does not acquire supremacy over [vast private] enterprises, it becomes their puppet, and they become the real State.