Oh, but Don, didn't you know?- those things are 'merely' the manifestations of consciousness in this 3-D world! The true ultimate source is in a different plane of Being! How do 'they' know that? They intuit it... and then they adapt/adopt some combination of linguistic phrases to describe it. Thereafter, even the intuiting is unnecessary, as one needs only to make some reference to the linguistic conventions!

So simple, once you get used to it.