The ungrateful man

Once upon a time there was an ungrateful man . He was very poor. One day a rich man was passing by him . When he see him he became very kind. He gave him 200 cows and buffalo. The ungrateful man became happy.
Day gone after day, the rich man became poor and the poor man became rich. One day, in the poor man's palace the rich man came . He beg some cows from the poor man. But the poor man didn't give him a single cow . The rich man gave him curse.
Day gone after day , one day a dangerous cyclone came in the palace of the ungrateful man. He was ruined for his ungratefulness.
Morality: Never be ungrateful