Human-nature definitions

I know human nature.

It's human nature to strive for your dream but a little bit of giving could make you feel serene.

I have studied human nature for the entirety of my existence.

We may miss the finer insight into human nature and the delicate touch in drawing character which Terence presents to us in his reproductions of Menander, but there is wonderful life and vigour and considerable variety in the Plautine embodiments of these different types.

Humiliating to human nature in general as are the annals of the 18th-century campaigns in Europe, there is no point of view from which they appear in a light so tragi-comic as from that afforded by Italian history.