The wise man thinks about his troubles only when there is some purpose in doing so; at other times he thinks about other things, or, if it is night, about nothing at all.

Every advance in civilization has been denounced as unnatural while it was recent

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.

No great achievement is possible without persistent work.

The psychology of adultery has been falsified by conventional morals, which assume, in monogamous countries, that attraction to one person cannot coexist with affection for another. Everybody knows that this is untrue.

One must expect a war between U.S.A. and U.S.S.R. which will begin with the total destruction of London. I think the war will last 30 years, and leave a world without civilised people, from which everything will have to build afresh - a process taking (say) 500 years.

Religions which have any very strong hold over men's actions have generally some instinctive basis.