‘You in me and me in you’

Joh 15:4 ESV  Abide in me, and I in you. As the branch cannot bear fruit by itself, unless it abides in the vine, neither can you, unless you abide in me.

I nice way to understand this is the bottle analogy. If you place an open bottle into a basin of water the bottle is in the water and the water is in the bottle. Both are true at the same time.