Youth is the period of harsh judgments, and a man seldom learns until he reaches thirty that human nature is made up not of simples, but of compounds.
I liked human beings, but I did not love human nature.
I don't like human nature, but I do like human beings.
I would write of the universal, not the provincial, in human nature.... I would write of characters, not of characteristics.
It is human nature to overestimate the thing you've never had.