I wish to describe it from my personal experience in spiritual journey as below:- 

1) We are not just this body mind but we are beyond it too and this body mind is too small as compared to the beyond. Beginning with touching our body all around till infinite is part of our body called as ‘beyond’ which we all share as oneness. I use wave part of an atom in quantum physics as metaphor or as another metaphor i use 4th Dimension as described in this YouTube 4D Toy video https://youtu.be/N_4VaG7ZQE8 

for our invisible body part known as beyond. If you could purchase this 4D Toys app and learn to play with it then you can experience this 4th Dimension too. 

2) When we are facing grief in our life then our attitude while facing it is very important. If we face it courageously then our invisible body part start growing beyond our body. So all is not lost during that time, but we are gaining that which cannot be gained routinely with our education etc.