We have in fact, two kinds of morality, side by side: one which we preach, but do not practice, and another which we practice, but seldom preach.

Moral indignation is one of the most harmful forces in the modern world, the more so as it can always be diverted to sinister uses by those who control propaganda.

Plato has dramatic strength ... but is quite unaware of the strength of the argument against his position ... and allows himself to be grossly unfair in arguing against it.

Machines have altered our way of life, but not our instincts. Consequently, there is maladjustment.

The degree of one's emotions varies inversely with one's knowledge of the facts - the less you know the hotter you get.

What science cannot discover, mankind cannot know.

Not to be absolutely certain is, I think, one of the essential things in rationality.