数学不是观赏性运动——你必须参与其中才能欣赏它的美。
I'm not a perfectionist, but I like to feel that things are done well. More important than that, I feel an endless need to learn, to improve, to evolve.
The obligation of subjects to the sovereign is understood to last as long, and no longer, than the power lasteth by which he is able to protect them.