The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
数学家研究纯数学不是因为它有用;他研究它是因为他喜欢它,他喜欢它是因为它美丽。
Never give up, never give in.
真正的美国发现还在我们面前。我们精神、我们人民、我们强大而不朽的土地的真正实现,尚未到来。
你不能让赞美或批评影响到你。陷入其中任何一种都是弱点。
Behavior is not just a reaction, it's a communication.