After you understand about the sun and the stars and the rotation of the earth, you may still miss the radiance of the sunset.

An unflinching determination to take the whole evidence into account is the only method of preservation against the fluctuating extremes of fashionable opinion.

Civilization advances by extending the number of important operations which we can perform without thinking of them.

Problems are only opportunities in disquise.

Youth is life as yet unblemished by much tragedy, but hardly by TV.

The art of progress is to preserve order amid change, and to preserve change amid order. Life refuses to be embalmed alive. The more prolonged the halt in some unrelieved system of order, the greater the crash of the dead society.

Each human being is a more complex structure than any social system to which he belongs.