The deepest principle in human nature is the craving to be appreciated.
It is human nature to hate the man whom you have hurt.
Scenery is fine - but human nature is finer.
Politeness is to human nature what warmth is to wax.
Human nature is evil, and goodness is caused by intentional activity.
Human nature is not black and white but black and grey.
It's human nature to gripe, but I'm going ahead and doing the best I can.
Human nature is not nearly as bad as it has been thought to be.
Human nature is potentially aggressive and destructive and potentially orderly and constructive.
Human Nature is the only science of man; and yet has been hitherto the most neglected.
It's human nature to blame someone else for your shortcomings or upsets.