Some of the non physical realizations I can think of are trust, love, hope and even fear. We would not live long without those things. Sure they may have chemical basis in the brain, but a chemical still doesn't really explain them, how we get in those states etc. A spiritually aware state has also produced certain effects in the brain in studies. You can live without God, obviously, but so many people don't want to there must be some benefit to them. Shoot, time for work, I'll have to be back later.