This is an authoritative statement given by the greatest authority, Narada Muni. If one gives another living entity unnecessary pain, one will certainly be punished by the laws of nature by a similar pain. Although the hunter Mrgari was uncivilized, he still had to suffer the results of his sinful activities. However, if a civilized man kills animals regularly in a slaughterhouse to maintain his so-called civilization, using scientific methods and machines to kill animals, one cannot even estimate the suffering awaiting him. So-called civilized people consider themselves very advanced in education, but they do not know about the stringent laws of nature. According to nature's law, it is a life for a life. We can hardly imagine the sufferings of one who maintains a slaughterhouse. He endures suffering not only in this life, but in his next life also. It is said that a hunter, murderer or killer is advised not to live and not to die. If he lives, he accumulates even more sins, which bring about more suffering in a future life. He is advised not to die because his dying means that he immediately begins to endure more suffering. Therefore he is advised not to live and not to die.