"The works of God are beautiful and great; let us, therefore, with all our might, strive to know them."

"See, I cast the die, and I write the book. Whether it is to be read by the people of the present or of the future makes no difference: let it await its reader for a hundred years, if God himself has s…"

"I have been a philosopher, and I have pondered the meaning of life."

"I have often tried to grasp that which I have found."

"I also ask you my friends not to condemn me entirely to the mill of mathematical calculations, and allow me time for philosophical speculations, my only pleasures."