Mathematics is not a spectator sport; to understand it, one must engage with it actively.
预言家在自己的国家及家庭里总是不受尊重。
把你的心挂在袖子上不是一个好计划;你应该把它放在里面,那里它运作得最好。
Being busy is a form of laziness—lazy thinking and indiscriminate action.