Glimpses of Eternity
I read a near-death experience account recently and the person described being back in her body as going into a box of solitude after experiencing the oneness of being part of everything on the other side.
Since reading that near death experience account, I can't get that idea out of my mind.
I think this might explain our yearning (some of us, anyway) to establish connections with people. Even people who consider themselves loners feel the need to be around others, occasionally, even though they prefer solitude, which causes them a lot of inner turmoil.
It's possibly a pull to be a part of, or a vague memory that we are a part of, a universal oneness we can't begin to comprehend.