You can easily find people who are ten times as rich at sixty as they were at twenty but not one of them will tell you that they are ten times as happy
I ... must continue to strive for more knowledge and more power, though the new knowledge always contradicts the old and the new power is the destruction of the fools who misuse it.
Money is indeed the most important thing in the world; and all sound and successful personal and national morality should have this fact for its basis.
I finished my first book seventy-six years ago. I offered it to every publisher on the English-speaking earth I had ever heard of. Their refusals were unanimous: and it did not get into print until, fifty years later; publishers would publish anything that had my name on it.