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

18. The purpose of setting goals is to win the game. The purpose of building systems is to continue playing the game. Atomic Habits

In the course of my life I have often had intimations in dreams "that I should make music." The same dream came to me sometimes in one form, and sometimes in another, but always saying the same or nearly the same words: Make and cultivate music, said the dream. And hitherto I imagined that this was only intended to exhort and encourage me in the study of philosophy, which has always been the pursuit of my life, and is the noblest and best of music. The Trials Of Socrates

The answer comes from the realization that genes for behavior, as well as for malaria resistance and teeth, are subject to natural selection. Why Is Sex Fun?: The Evolution of Human Sexuality