“Whatever you cannot understand, you cannot possess. ”

“I can promise to be sincere, but I cannot promise to be impartial.”

“He who cannot draw on three thousand years is living from hand to mouth.”

“The greatest happiness for the thinking person is to have explored the explorable and to venerate in equanimity that which cannot be explored.”

“Mathematicians are like Frenchmen: whatever you say to them they translate into their own language and forthwith it is something entirely different.”

“Whatever truths or fables you may find in a thousand books, it is all a tower of Babel unless love holds it together.”

“He values my understanding and talents more highly than my heart, but I am proud of the latter only. It is the sole source of everything of our strength, happiness, and misery. All the knowledge I possess every one else can acquire, but my heart is exclusively my own.”