We must remember that in time of war what is said on the enemy's side of the front is always propaganda and what is said on our side of the front is truth and righteousness, the cause of humanity and a crusade for peace.

Because the results are expressed in numbers, it is easy to make the mistake of thinking that the intelligence test is a measure like a foot ruler or a pair of scales. It is, of course, a quite different sort of measure. Intelligence is not an abstraction like length and weight; it is an exceedingly complicated notion - which nobody has yet succeeded in defining.

Here lay the political genius of Franklin Roosevelt: that in his own time he knew what were the questions that had to be answered, even though he himself did not always find the full answer.

Life is an irreversible process and for that reason its future can never be a repetition of the past.

Great men, even during their lifetime, are usually known to the public only through a fictitious personality.

The study of error is not only in the highest degree prophylactic, but it serves as a stimulating introduction to the study of truth.

The tendency of the casual mind is to pick out or stumble upon a sample which supports or defies its prejudices, and then to make it the representative of a whole class.