This person would like to even live, maybe not in the physical form, but in a subtle form, maybe an astral form. And even then , it’s not just making mistakes by wanting to be immortal, but he could be deluded into believing in the demon’s promise, and then later could even became a demon himself. So, it is very risky to try, to get it a quicker way or desire in such a not very proper thinking; of a desired kind of state. We should not always be thinking or wanting this and that. We just want to be liberated and maybe maximum want to become Buddha, so that we can liberate others.