All knowledge, we feel, must be built up upon our instinctive beliefs; and if these are rejected, nothing is left.

The very best proof that something can be done is that someone has already done it.

The key to happiness is accepting one unpleasant reality every day.

I consider the official Catholic attitude on divorce, birth control, and censorship exceedingly dangerous to mankind.

What men really want is not knowledge but certainty.

One of the chief obstacles to intelligence is credulity, and credulity could be enormously diminished by instructions as to the prevalent forms of mendacity. Credulity is a greater evil in the present day than it ever was before, because, owing to the growth of education, it is much easier than it used to be to spread misinformation, and, owing to democracy, the spread of misinformation is more important than in former times to the holders of power.

We believe, first and foremost, what makes us feel that we are fine fellows.