Americans are apt to be unduly interested in discovering what average opinion believes average opinion to be.

Nothing mattered except states of mind, chiefly our own.

A study of the history of opinion is a necessary preliminary to the emancipation of the mind.

The difficulty lies, not in the new ideas, but in escaping from the old ones.

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

But my lord, when we addressed this issue a few years ago, didn't you argue the other side?" He said, "That's true, but when I get more evidence I sometimes change my mind. What do you do?

There is no harm in being sometimes wrong - especially if one is promptly found out.