About to make a serious mistake?

Two men were adrift in an open boat, and it looked bad for them. Finally one of them, frightened, began to pray.
 
“O Lord,” he prayed, “I’ve broken most of thy commandments. I’ve been a hard drinker, I cheated on my wife, I gambled, but if my life is spared now I’ll promise to never again…”
 
“Wait a minute, Jack,” said his friend. “Before you promise anything, I think I see a sail.”
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