Although a man may get involved in the remembrance of death, he may not be serious; neither may he be convinced. In this case, this remembrance will not be instructive. This is true in the case of those corrupted people who verbally remember death, but deep inside they are not ready to embrace death.
For this reason, after his previous command concerning making the heart submissive, Imam ‘Ali emphasized that we should convince our hearts that this world is not eternal. This very conviction makes man ready for the voyage towards the Hereafter.
Imam, concerning this, has said, "Anybody who believes that one day death will separate him from his friends, that he will be put in the grave, that he will have to account the Day of Judgment for what he has done, that the wealth here will not help him out; and that what he has sent in advance will be of value, should shorten his desires and lengthen the amount of his work."
This very stage of confession and conviction has made some wonder: How is it possible for a man to believe in death and the exact accounting for in the Doomsday and be happy at the same time?
"عَجِبتُ لِمَن ايقن بالموتِ كيفَ يَضْحكُ عَجِبتُ لِمَن ايقن بالحسابِ كيفَ يَفْرَح"
“I wonder at one who is certain of death – how does he laugh? I wonder at one who is certain of the reckoning – how is he joyful?”