The difference.
To me it is a mystery as to how space, mass, and energy came into existence.
I agree with you when you write that: “To imagine that you have it all figured out is just another delusion.”
I certainly have not figured out everything, and since you did not answer my question it seems to me that you also have not figured out everything.
Question: Would you say that mass can be considered as three in one, in other words, mass needs space to exist and contains intrinsic energy? (space, mass, energy all in one.)