Three nuns were returning to the convent after a day of volunteer nursing at a local medical care centre. They were travelling along a back road when their car stopped.

After a quick memory search, they remembered they had forgotten to get gas the last time out.

As they were deciding which one would walk for to a gas station, a pickup truck drove up. The driver had plenty of gas and offered some, but he didn't have anything to put it in.

The nuns realized they had the ideal container for the donated gas, they thanked the driver and he went on his way.

A few minutes later an eighteen wheeler came down the road and saw the nuns pouring the contents of a bed pan into their gas tank.

The driver nudged his partner and said, "That's what I call true faith."