“There is nothing is more musical than a sunset. He who feels what he sees will find no more beautiful example of development in all that book which, alas, musicians read but too little - the book of Nature.”
“I mean the word proof not in the sense of the lawyers, who set two half proofs equal to a whole one, but in the sense of a mathematician, where half proof = 0, and it is demanded for proof that every doubt becomes impossible.”