写作是一种勇气，面对自己的恶魔。
"Escrever é um ato de coragem, de enfrentar os próprios demônios."
数学的本质在于它的自由。
People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can't find them, make them.
只为自己活着的人，不值得活在世上。
真正的进步来自于挑战现状。
音乐本应鼓舞人心。
金银像其他商品一样具有内在价值，这不是任意的，而是取决于它们的稀缺性、获取它们所耗费的劳动量以及生产它们的矿山所投入的资本价值。