In the heart of every parent lives the tightly coiled nightmare that his child will die. It might spring at logical times—when a toddler runs into the street, say—or it might sneak up in quieter moments. The fear is a helpful evolutionary motivation for parents to protect their children, but it's haunting nonetheless.
The ancient Stoic philosopher Epictetus advised parents to indulge that fear. “What harm is it, just when you are kissing your little child, to say: Tomorrow you will die?” he wrote in his Discourses.
Some might say Epictetus was an asshole. William Irvine thinks he was on to something.