Isn't it a great concept?

But what's behind it? Is it the belief in immortality?
I guess every person who is looking at this concept is creating his own meaning.

You can believe in karma, and try to become a good person. And you can believe that there's no escape from this earth and this consciousness, and do whatever you like.

Maybe we all have a single soul, and while you are alive you give your personality to people around you and go on living in the generations to come. That's also immortality and reincarnation. Of sorts.