Imam As-Sadiq (a.s.) said:
مَنْ يَمُوتُ بالذُّنُوبِ أَكْثَرُ مِمَّنْ يَمُوتُ بِالآجالِ وَ مَنْ يَعِيشُ بِالإِحْسانِ أَكْثَرُ مِمَّنْ يَعِيشُ بِالأَعْمارِ
Those who die as a result of sin are more than those who die due to natural death, and those who have a long life as a result of beneficence are more than those who have a long life due to natural life.1
It is proved today that the cause of most physical diseases lies in spiritual and emotional factors, and one of the most important causes of mental diseases is the heavy pressures imposed on man’s soul by his conscience.
A sinner is judged in the court of conscience and suffers painful spiritual punishments and its reaction is manifested in the body and soul in the form of diseases and even death. On the contrary, the beneficent people are encouraged by their conscience and this spiritual encouragement empowers them and makes them cheerful and increases their life span. Hence, sin shortens life, and beneficence prolongs it.