Believe me! The secret of reaping the greatest fruitfulness and the greatest enjoyment from life is to live dangerously!

The doctrine of equality! There exists no more poisonous poison: for it seems to be preached by justice itself, while it is the end of justice.

Whatever is done for love always occurs beyond good and evil.

Mathematics would certainly have not come into existence if one had known from the beginning that there was in nature no exactly straight line, no actual circle, no absolute magnitude.

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.

Not by wrath does one kill, but by laughter.

He who laughs best today, will also laughs last.

Mystical explanations are considered deep. The truth is that they are not even superficial.

Because men really respect only that which was founded of old and has developed slowly, he who wants to live on after his death must take care not only of his posterity but even more of his past.

Man... cannot learn to forget, but hangs on the past: however far or fast he runs, that chain runs with him.