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。
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.
当且仅当所有投资者都持有均值-方差有效的投资组合时，市场组合才是有效的。
写作是一种乐观的行为。如果你觉得它不重要，你就不会费心去做。
"The best music comes from the darkest places."
Innovation in mining technology is what will keep the industry alive in the next century.
要发出光芒，必须忍受燃烧。