Nothing in Nature, World, Universe and in Human beings’ existence is eternal. Everything is temporary.
Let’s start with the smallest pieces: it is the Atom, whose main part is Nucleus, which is changing its structure during nuclear reactions and it is never the same. Every second it is different, so it means it is not the same as it was one second before. In conclusion, everything is changing in the same way, because Atoms are the bricks for everything: Our – Human beings’ and all other creatures’ bodies, Nature – trees, flowers and grass, our Galaxy – Milky Way and all our Universe.
This picture symbolizes one World changing into another one, they are connected, but at the same time, one of them is Collapsing and the other one is coming to be instead of the old one. The Main Idea is to understand, that nothing is Eternal, everything is in Eternal Changing.