Dr Paul Brand was speaking to a medical college in India on "Let your light so shine before men that they may behold your good works and glorify your Father." In front of the lectern was a oil lamp, with its cotton wick burning from the shallow dish of oil. As he preached, the lamp ran out of oil, the wick burned dry, and the smoke made him cough. He immediately used the opportunity.

"Some of us here are like this wick," he said. "We're trying to shine for the glory of God, but we stink. That's what happens when we use ourselves as the fuel of our witness rather than the Holy Spirit. "Wicks can last indefinitely, burning brightly and without irritating smoke, if the fuel, the Holy "Spirit, is in constant supply."