善师四夷者，能制四夷；不善师外夷者，外夷制之。
出自《海国图志序》。善于学习外国的长处，就能够征服外国;不善于学习外国的长处就会被外国所征服。
归纳行为是一个用来描述在不确定性下做出决策的过程的术语，其后果取决于未知的自然状态。
"The essence of mathematics lies in its freedom."
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
War is an ugly thing， but not the ugliest of things； the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse.
Life is a series of moments, and each moment is a story.
无人机的未来属于那些敢于突破边界的人。