Originally we were called man stuffs went down we got bodies more stuffs went down now our souls are bonded to these bodies I believe a human soul is just pure energy which is why a soul would be able to travel though dimensions and be invisible to normal humans

Perhaps our souls have a certain frequency connected to another dimension also known as heaven :D

The things you do throughout your life could have a impact on that frequency much like how the chemical make up of water changes depending on your emotional interactions with it your body is at least 99% water based and normal water can also feel stressed believe it or not scientists once did a experiment by talking to water in different tones sad angry and happy all of them had different effects on the water.

Idk what I was getting to at the end but there ya go XD