Hardest catalyst to understand

[Minyatur]

I believe the mental pain resulted from the physical pain of someone we love is the hardest catalyst to process.
And if the entity that suffers is 3D that pain might make some sense in the big picture of spiritual evolution.
However I cannot comprehend suffering at 2D level and certainly the catalyst is really tough to process on my side.

Can someone explain to me why the 2D physical suffering is necessary considering the fact that there is no spiritual gain for the entity that suffers?  4D, 5D, 6D don't have to deal with physical suffering why isn't 2D spared of it?

What is the "positive" (talking about big picture) a 3D gets from a 2D physical suffering?  
How can I be positive about it knowing how useless that suffering is?

I don't think there is all that much of a difference between 2D and 3D entities. I would even venture to say that pain in 3D relates a whole lot to how close we still are to 2D, we have it by extension. To find acceptance of pain in humans, I really tend to always bring it down to 2D and how it is a part of nature. Outside the human drama, there is a deer somewhere that broke its leg and died of a fever and that had nothing whatsoever to do with us as humans. So everything is not about us and to understand the way of things we have to move away from a view centered upon ourselves and our evolution.

Each density has its catalysts to propell evolution and pain in 2D should relate to be a catalyst for self-realization and moving toward 3D.

Beyond that, I believe the One seeks to experience itself in various and complex ways and for this I believe that in 2D a lot of biases are accumulated to create a unique path and journey. The reason why the highest service is merely the offering of the self is because what we are experiencing as the One experiencing the One is infinite opportunity. Tripping on a rock, meeting a predator, falling in love, etc, is infinite opportunity and meeting the Creator as the Creator. Each expression of the Creator, as a multidimensional entity, seeks to be a unique aspect of unity in its very being. So while a lot of things may seem unfair, they become understood at a later point of an entity's journey and everything is seen as bound in free will.