To be able to concentrate for a considerable time is essential to difficult achievement.

For over two thousand years it has been the custom among earnest moralists to decry happiness as something degraded and unworthy

Aristotle maintained that women have fewer teeth than men; although he was twice married, it never occurred to him to verify this statement by examining his wives' mouths.

When the intensity of emotional conviction subsides, a man who is in the habit of reasoning will search for logical grounds in favour of the belief which he finds in himself.

Public opinion is always more tyrannical towards those who obviously fear it than towards those who feel indifferent to it.

That the world is in a bad shape is undeniable, but there is not the faintest reason in history to suppose that Christianity offers a way out.

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