Some care is needed in using Descartes' argument. "I think, therefore I am" says rather more than is strictly certain. It might seem as though we are quite sure of being the same person to-day as we were yesterday, and this is no doubt true in some sense. But the real Self is as hard to arrive at as the real table, and does not seem to have that absolute, convincing certainty that belongs to particular experiences.

Worry is a form of fear.

That the world is in a bad shape is undeniable, but there is not the faintest reason in history to suppose that Christianity offers a way out.

Collective fear stimulates herd instinct, and tends to produce ferocity toward those who are not regarded as members of the herd.

An Honest politician will not be tolerated by a democracy unless he is very stupid ... because only a very stupid man can honestly share the prejudices of more than half the nation.

So far I have been speaking of theoretical science, which is an attempt to understand the world. Practical science, which is an attempt to change the world, has been important from the first, and has continually increased in importance, until it has almost ousted theoretical science from men's thoughts.

Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines.