"The greatest evil is not done by evil people, but by good people who stand by and do nothing."

"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."

"What is not started today is never finished tomorrow."

"Man is not born to solve the problems of the universe, but to find out what he has to do in order to limit himself to the limits of his comprehension."

"Es ist nichts schrecklicher als eine tätige Unwissenheit."