I think it's hard to imagine because of our comprehension of opposites.

This might be crazy or stupid idea but. "Philosophically" speaking, I tend to think about it in this way; imagine a Big Freeze, where only 1 sub-atomic "particle" is left at the end. That "energy" is so tiny but yet it would be all that there is, and in the infinite nothingness, it would be everything. Super tiny, super dense, yet super massive as it is everything there is.

Don't ask me what happens next though, we're back at those first fractions of the second. xD

As always, thank you for reading and for your valuable input!