Don't worry about it and just be good, damn it.
I'm going to throw in a rant here that I've been brewing for the past couple days just because:
Rebirth is likely oversimplified to a disgusting degree by everyone, [if it occurs.] I liken the rebirth of ourselves to the rebirth of stars. Our sun was born from the remnants of now-dead stars. Maybe not just a single dead star, maybe a whole bunch with different compositions that, after they went nova, formed the cosmic nursery from which our sun coalesced. (We know this because there are heavy elements in our sun which could've only come from the nucleosynthesis of bigger stars.) But if those stars didn't exist at the locations they did, didn't have the elemental composition they did, didn't have the size they did, didn't go nova at the time they did, our Sun may've accordingly had different properties. I imagine rebirth to be as equally complex; to say that our sun exists as it does due to the lifetime of another star would be accurate, but it produces a representation of linear causality in our minds which is a gross oversimplification.
"What holds attention determines action." - William James