SHAFAQNA – The Prophet of Islam (PBUH) was asked: Who are the cleverest of people? The Prophet (PBUH) replied: Those who remember death more and prepare for it; they are the clever ones who have attained the honour of this world and the respect of the hereafter for themselves . In another narration, the Prophet (PBUH) said: Remember death a lot, because remembering death will cleanse sins and make the human being unenthusiastic towards the world .
 Al-Kafi,Vol. 3, Page 258.
 Kanzul Ummal, Vol.15, page 543.