The biggest problem is not to let people accept new ideas, but to let them forget the old ones.

The power to become habituated to his surroundings is a marked characteristic of mankind.

He had one illusion - France; and one disillusion - mankind, including Frenchmen.

When the accumulation of wealth is no longer of high social importance, there will be great changes in the code of morals.

I believe myself to be writing a book on economic theory which will largely revolutionize - not, I suppose, at once but in the course of the next ten years - the way the world thinks about economic problems.

Long run is a misleading guide to current affairs. In the long run we are all dead.

The expected never happens; it is the unexpected always.