As we know there are only three layers of mind of which a human in his whole life experience out of which it is not possible to call it a human life.
1) Enviornment layer.
2) Body layer.
3) Mental mind layer.
It is said by many text and many gurus that everything is here nothing is in or nothing is out.
We will do our observation on that and try to find out what these text are trying to say. I personally never read such texts but I know through internet. And I have observation of this so I thought maybe it would be right to guide about it.
Experiment on environment and body layer.
Body and environment are one there is no actual real distance between them. There is no in or out experience of a body.
Like when we say that I experience it outside of body that is wrong interpretation of observation..
Everything which we experience is of our body only. We never actually experience enviornment layer at all in our whole life. How so?
Observer carefully and you will see that everything you feel is feeling of body. Touch a tree that feeling of tree and the look of tree both are experince of your own body not something a tree which is outside. The shape and colour of tree is experincing of your body eyes. Touch is feeling of your own body. Do this with voice you will notice that voice is actually vibrating on your ear not outside or inside of your ear.
This shows that perception works totally different from how we think it works.
This also proof that there is no experience of environment layer it's just experience of body layer.
Now how actually perception works?
See there is nothing which is physical or outside and there is nothing which is non- physical and inside. It is all about where our attention goes that thing becomes real for us.
Just like in case of enviornment before observation deeply, we see enviornment as seperate from us and something which happens outside. But when we pay enough attention we see that it is not there it is just experience of body itself. So our perception works based on our attention. If our attention is completely on environment that environment will be precived as real. If on body then body will, similarly for thoughts.
You will see that thoughts are what actually we experience just like enviornment to body similarly body to thoughts.
All this come up to conclusion that nothing is physical or non-physical but it's our attention which makes things as real or unreal. Or in and out. So we don't experience things outside or inside. We experience things here and now based on our attention power. This why yogi tries to increase their attention power only by doing so many types of meditations.
You can now even see the power and importance of sum up meditation. how including as much as experience possible will increase your attention so much.
Basically by doing such meditation your perception will increase.
Normal attention looks something like this -
Yogi attention -
This leads to state of nirvana i.e. dissolve of one mind. Here ends individualism and start oneness.
Caution - This meditation should done under supervision of someone who done it.
If anything happens like unstable energy then I am not taking responsibility of it. This is very powerful meditation. Can be used for checking oneness only one time. That much won't hurt you but if continues then I don't know what will happen.