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。
学习应使人感到快乐,否则不能称之为真正的学习。
We must balance the need for energy security with the urgency of reducing emissions.