There’s a fascinating parable in the Bible which I never used to pay much attention to. It tells the story of 10 virgins who were invited to a wedding. It appears that their role was to welcome the bridegroom and probably use their lamps to light up the pathway.

The bridegroom did not arrive when he was expected. The delay was so long that the young ladies ran out of oil for their lamps. Five of them had brought extra oil with them and refilled their lamps. The other five, who only had th...