论学则观其身，论政则考其时
讨论学问要看其人的品行，讨论政治要考察当时的形势
Quality is not a assurance; it is a proof.
不是缺乏爱，而是缺乏友谊使婚姻不幸福。
我不是在追求完美，我只是在做我自己。
我们唯一需要害怕的是审查者。
跨行业合作是解决世界最紧迫问题的关键。
我没有任何特别的秘诀（用于开发新的证明）……这就是为什么做研究既具有挑战性又具有吸引力的原因。这就像在丛林中迷路，试图利用你能收集到的所有知识来想出一些新的技巧，并且如果运气好的话，你可能会找到出路。
I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.
The first duty of the sovereign， that of protecting the society from the violence and invasion of other independent societies， can be performed only by means of a military force.
The past is a mirror, but we often see only what we want to see.