Sometimes nothing is as helpful as a good metaphor.

In his book The God Instinct, Tom Stella shares this story: A number of men who made their living as porters were hired one day to carry a huge load of supplies for a group on safari. Their loads were unusually heavy and the trek through the jungle was on a rough path. Several days into the journey they stopped, unshouldered their loads and refused to go on. No pleas, bribes or threats worked in terms of persuading them to go on. Asked why they couldn’t continue, they answered: “We can’t go on; we have to wait for our souls to catch up with us.”