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.

The merely well-informed man is the most useless bore on God's earth.

Everyone is a philosopher. Not everyone is good at it.

It is not paradox to say that in our most theoretical moods we may be nearest to our most practical applications.

The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.

In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory.

In a living civilization there is always an element of unrest, for sensitiveness to ideas means curiosity, adventure, change. Civilized order survives on its merits and is transformed by its power of recognizing its imperfections.