"All truly wise thoughts have been thought already thousands of times; but to make them truly ours, we must think them over again honestly, until they take root in our personal experience."
"Every day we should hear at least one little song, read one good poem, see one exquisite picture, and, if possible, speak a few sensible words."
"Age does not make us childish, as some say; it finds us true children."
"Es ist nicht genug, zu wissen, man muß auch anwenden; es ist nicht genug, zu wollen, man muß auch tun."
"This is the true measure of love: when we believe that we alone can love, that no one could ever have loved so before us, and that no one will ever love in the same way after us."
"Know thyself? If I knew myself, I'd run away."