Necessity is the mistress and guide of nature.
Experience is a truer guide than the words of others.
Just as a well-filled day brings blessed sleep, so a well-employed life brings a blessed death.
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.
The knowledge of all things is possible
Of the original phenomena, light is the most enthralling.