DEATH !!!
Those of us are blessed who remember death frequently. The word death has infinite lessons to teach. It always reminds the person of the limited time s/he possess in the life, compelling the person to use their time wisely, forcing the person to prepare for the world after, motivates a person to do something great in the life so that the person may be remembered for the eternity, enjoying the individual moments. It also tells the person that nothing is permanent in life.
In short the word death adds meaning to the life .
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