The Axiom of Choice is necessary to select a set from an infinite number of socks, but not an infinite number of shoes.

In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.

It is possible that mankind is on the threshold of a golden age; but, if so, it will be necessary first to slay the dragon that guards the door, and this dragon is religion.

Whether science-and indeed civilization in general-can long survive depends upon psychology, that is to say, it depends upon what human beings desire.

The finding of arguments for a conclusion given in advance is not philosophy, but special pleading

The commonest objection to birth control is that it is against nature.

Indemnity for the past and security for the future.