Man is not born to solve the problem of the universe, but to find out what he has to do; and to restrain himself within the limits of his comprehension.

Help me to discover Thy truth, O Lord, and preserve me from those who have already found it

True art can only spring from the intimate linking of the serious and the playful.

Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.

A king there was once reigning, Who had a goodly flea, Him loved he without feigning, As his own son were he!

What have the Germans gained by their boasted freedom of the press, except the liberty of abusing each other as they like?

What one doesn't understand one doesn't possess.