The only absolute knowledge attainable by man is that life is meaningless.

Life consists in penetrating the unknown, and fashioning our actions in accord with the new knowledge thus acquired.

Spirit is the life that itself cuts into life: with its own torment it increases its own knowledge. Did you already know that?

The supreme guide in life is knowledge.

Our true mentor in life is science.

What is important is not the quantity of your knowledge but its quality. You can know many things without knowing the most important.