“You must go further than I did," Nedra said. "You know that."
"With your life. You must become free."
She did not explain it; she could not. It was not a matter of living alone, though in her case this had been necessary. The freedom she meant was self-conquest. It was not a natural state. It was meant only for those who would risk everything for it, who were aware that without it life is only appetites until the teeth are gone.” 

- James Salter, Light Years