"Love is the only thing that can save us from ourselves, but it is also the most fragile and elusive of all emotions."
行动是正确的,因为它们倾向于促进幸福;错误是因为它们倾向于产生与幸福相反的结果。
科学家研究自然并非因为它有用;他研究它是因为他从中获得乐趣,而他从中获得乐趣是因为它是美丽的。