इहैकस्थं जगत्कृत्स्नं पश्याद्य सचराचरम्।मम देहे गुडाकेश यच्चान्यद्द्रष्टुमिच्छसि॥
ihaika-sthaṃ jagat kṛtsnaṃ paśyādya sa-carācarammama dehe guḍākeśa yac cānyad draṣṭum icchasi
Word by word
The verse says
See here, standing in one place, the whole world together — all that moves and all that does not — here in my body, Arjuna, and whatever else you wish to see.
In plain words
Ihaika-sthaṃ jagat kṛtsnam — the whole world, standing in one place.
Everything, at once, in one body.
And then the last clause, which is almost casual: and anything else you want.
Where you've felt this · at work
An architect pulls out the model of the whole development — every building, the roads, the trees, the little figures for scale. For two years you have been looking at drawings of one block at a time. The model is not more information. It is the first time the parts have been in the same room.
Going deeper
Seeing everything at once is a different kind of knowing from seeing everything in turn, and that difference is what is being offered.
Arjuna has been told about the whole for ten chapters, piece by piece, in sequence. Language can only do it that way. What is promised here is simultaneity — the entire thing present together, which no amount of good description can produce, because description takes time and the thing described does not.
That is why the request could not have been met by more explanation.
It also quietly accounts for why what follows overwhelms him. Explanation arrives at the pace the listener can take. A whole, all at once, arrives at its own pace, and there is no version of it that is sized to a person.