"I'm not sure why some folks associate 'being religious' with moping around, brooding on the futility of it all and how everybody should act as if their pet canary died.
"I understand feeling tired, guilty, and dragging through the day. Decades of undiagnosed major depression saw to that, and that's another topic.
"But we live in a universe filled with wonders: a beautiful, ordered cosmos; unfolding in accord with physical laws which we are beginning to understand...."
'Imagining' the phenomenon in the sense of trying to wrap my mind around it? That, I've tried - with limited success. The math is beyond my level - but the logic is straightforward enough, although rather far-removed from everyday experience.
(Wikipedia has a pretty good page on this subjected: https://en.wikipedia.org/wiki/Metric_expansion_of_space )