It is the patriotic duty of every man to lie for his country.

Mathematics is pure language - the language of science. It is unique among languages in its ability to provide precise expression for every thought or concept that can be formulated in its terms.

Every neurotic is partly in the right.

What is courage? Courage is the willingness to risk failure...There is only one danger I find in life, and that, indeed, is a real one. You may take too many precautions.

Exaggerated sensitiveness is an expression of the feeling of inferiority.

If you wish to educate a child who has gone wrong, then you must, above all, keep your attention fixed on the intersection of two charmed circles.

Every pampered child becomes a hated child.... There is no greater evil than the pampering of children.