He who walks straight rarely falls.

Whoever despises the high wisdom of mathematics nourishes himself on delusion and will never still the sophistic sciences whose only product is an eternal uproar.

Just as courage imperils life, fear protects it.

Everything comes from everything, and everything is made out of everything, and everything returns into everything.

I have wasted my hours.

Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.

When you are alone you are all your own.