This is how I understand the Buddhism. If its wrong pls correct me.
According to the current scientific theories. Energy cannot be create & cannot be destroyed.
So the only person who discovered how to create and and destroy energy is LORD BUDDHA. Inside our body we have the operating system called soul. This is the thing going around the SANSARAYA. That's why lord buddha told "Me shariraya winasha wena sului kiyala. But our soul never dies. To destroy this soul we have to go to nirvanaya. In old days buddhas teached collect PIN and dont do PAW. These are the ways how to increase our energy. Every animal have a energy for his soul. Ex-: Human has a energy around 50 - 60/ Animals has 50-40/ Yaksha 40-0/ Deviyan 60-80/ - When we doing paw our energy will reduced. If we doing PIN our energy will rise. End of the life. There will be a balance energy. According to this our soul will go to the right place.
If im wrong pls correct me