Human nature (n.) is what remains when you discard as artificial whatever belongs to one nation or one rank and not another.
Human nature (n.) can hold two souls in one body: what the unity of the subject forbids at one instant, succession allows over time.
Human nature (n.) is a set of characteristics that are accidental in origin and can again be reformed by the right social institutions.
Human nature (n.) as we lament it is the creature of our own fantasy, an infant slave and tyrant crammed with knowledge but empty of sense, while the natural man is cast in another mould.
Human nature (n.) as the knowledge of men is the philosopher's final study, which fathers want to make the child's first lesson: teach things as they are before teaching how they appear to us.
Human nature (n.) as a study needs a great wish to know men, impartial judgment, and a heart sensitive enough to understand every passion and calm enough to be free of them: earlier, men are strangers to him; later, he is like them.