It is only our deeds that reveal who we are.

Error is just as important a condition of life's progress as truth

The world will ask you who you are, and if you don't know, the world will tell you.

Insight that dawns slowly seems to me to have more lasting effects than a fitful idealism, which is unlikely to hold out for long.

Unfortunately, there can be no doubt that man is, on the whole, less good than he imagines himself or wants to be. Everyone carries a shadow, and the less it is embodied in the individual's conscious life, the blacker and darker it is. If an inferiority is conscious, one always has a chance to correct it

When an inner situation is not made conscious, it appears outside as fate.

Science is not ... a perfect instrument, but it is a superb and invaluable tool that works harm only when taken as an end in itself.