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.
Leadership is about inspiring people to do things they never thought they could do.
解析：意在言外，得意忘言。
Only a life lived for others is a life worthwhile.