This du-a'a known as "supplication of the youth stricken for his sin," is quoted from the work of Kaf-ami and from Muhaj al Da-wat by Sayyid ibn tawus. Through Imam Hussain(as) it is reported that one day he and his father, after performing Hajj, caught sight of a paralysed young man crying his eyes out in repentance. They went near to console him and find out the reason of his sorry plight. He was a habitual sinner, always teased his father, disobeyed him and treated him with contempt. One day, disgusted, the father invoked curse upon him. So he was affected with paralysis. Then and there Imam Ali ibn abi Talib(as) wrote his dua'a and gave it to him with [bad word] to recite after Isha salat. Next day fully cured, he came to Imam Ali and said that he had recited the dua'a as told and went to sleep. He saw the Holy prophet(sa) in the dream. The holy prophet, gently touched his body with his hand and asked him to remember this dua'a as it contain ismi azam (the great name of Allah).
Recite this dua'a after Isha salat. It brings countless blessings. All your legitimate desires will be fulfilled. It drives away poverty and sickness. Sins are for given. Debts are cleared. Enemies [bad word] friends. Domestic affairs are set aright. Disputes are settled in your favour. Prisoners are set free mental worries disappear. Prosperity, sound mind and healthy body stand by you at all times.
Mercy and forgiveness of sins are the main advantages the almighty Allah makes available if this dua'a is recited regularly.