Persistence in research often pays off when you least expect it.
Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.
未经审视的生活不值得过。
采矿业必须发展以满足不断变化的世界的需求。
The secret of being miserable is to have leisure to bother about whether you are happy or not.