The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is generally understood. Indeed, the world is ruled by little else.

It is investment, i.e. the increased production of material wealth in the shape of capital goods, which alone increases national wealth.

One's knowledge and experience are definitely limited and there are seldom more than two or three enterprises at any given time in which I personally feel myself entitled to put full confidence.

When somebody persuades me I am wrong, I change my mind.

Well, when I get new information, I rethink my position. What, sir, do you do with new information?

God has arrived. I met him on the 5:15 train.

It has been pointed out already that no knowledge of probabilities, less in degree than certainty, helps us to know what conclusions are true, and that there is no direct relation between the truth of a proposition and its probability. Probability begins and ends with probability.