“Swallowing sunshine is not at all difficult, and it works miracles of power, but some people are too lazy to do it,” wrote Unitarian Universalist clergyman Alden Eugene Bartlett in a 1918 guide to happiness. He advised, however, against swallowing too quickly. “If you have only been existing, half-dead,” he warned, “you will purify your blood so fast it will make you dizzy.”

The Talmud tells of a third-century rabbi named Joseph who died, saw a heavenly paradise, returned to life, and told his father of a world to come that would be “the reverse of this one—those who are on top here were below there, and vice versa.” “My son,” said his father, “you have seen a corrected world.”