在数学中，就像在生活中一样，最深刻的发现往往来自于提出最简单的问题。
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.
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.
The study of psychology must include the study of the environment in which the mind operates.