The biggest problem with the European Union is that it is not a state, but it pretends to be one.
Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.
在商业上你必须无情,但同时也要公平。
The greatest theorems often arise from questioning the obvious.
灵魂是精神与身体之间的活生生的桥梁。
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.