Behavior evolves through natural selection, just as anatomy does. Hence if sex is enjoyable, natural selection must have been responsible for that outcome. Why Is Sex Fun?: The Evolution of Human Sexuality

Deception, flattering, lying, deluding, talking behind the back, putting up a false front, living in borrowed splendor, wearing a mask, hiding behind convention, playing a role for others and for oneself -- in short, a continuous fluttering around the solitary flame of vanity -- is so much the rule and the law among men that there is almost nothing which is less comprehensible than how an honest and pure drive for truth could have arisen among them. On Truth and Lies in a Nonmoral Sense

He tried to weigh his soul to see if it was a poet's soul. Melancholy was the dominant note of his temperament, he thought, but it was a melancholy tempered by recurrences of faith and resignation and simple joy. If he could give expression to it in a book of poems perhaps men would listen. Dubliners

They are always asking a writer why he does not write like somebody else, or a painter why he does not paint like somebody else, quite oblivious of the fact that if either of them did anything of the kind he would cease to be an artist. The Soul of Man Under Socialism