From him, from one of our companions, raising it,said, ‘Abu Abdullah -asws said: ‘How many are the ones who seek for the world and do not achieve it, and its achievers have separated from it (have died). So do not pre-occupy ‘Nafs’ (yourselves) in seeking it (too much) from performing your deed, and beseech it from its Giver and its Owner.
So how many are the greedy ones upon the world were cut down and pre-occupied themselves with whatever they achieved from it, (while keep themselves away) from seeking the Hereafter – until one’s life-time perished and he realised his death’. وَ قَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) الْمَسْجُونُ مَنْ سَجَنَتْهُ دُنْيَاهُ عَنْ آخِرَتِهِ . And Abu Abdullah -asws said: ‘The (real) prisoner is that one whose world has imprisoned him from his Hereafter’ .
And from him, raising it, (It has been narrated) from Abu Ja’far -asws having said: ‘When a man comes to the age of forty it is said to him: ‘Take a caution, for you are without an excuse’, and there is no person of forty (years of age) more rightful with the caution than a person of twenty, for what is seeking them both, is the one (death) and it is not sleeping. Therefore, work for what is in front of you from the horrors and stay away from the useless speech’.