I got this from the awesome blog of Paulo Coelho:
A group of devils were trying to enter the soul of a holy man who lived near Cairo; they had already tempted him with Nubian women, Egyptian food, Libyan treasure, but nothing had worked.
One day, Satan passed and saw his servants’ efforts.
– You’re hopeless – said Satan. – You haven’t used the only technique no one can resist; I’ll teach you.
He went over to the holy man and whispered in his ear:
– Remember the priest who studied under you? He’s just been made Bishop of Alexandria.
Immediately, the holy man was filled with rage, and blasphemed against God’s injustice.
– The next time, use this temptation – said Satan to his subjects.
“Men can resist almost everything, but they are always jealous of the victory of a fellow man.”