"It's the secret of immortality! He told Athenos that its name was the Crystal of Life, because it gives life and immortality, and by using its power, they would be able to live until the end of this universe, perhaps after millions of years, who knows.
But the scientists disbelieved him, and others said that even if such a power existed, it would be contrary to the laws of nature, for death is a part of life, and if everyone lived forever, this would cause our numbers to increase in an exaggerated way, and this could lead to famines, epidemics, and wars over resources.