And read about. I mean, these folks built the Pyramids, and some other technologically advanced structures. The hanging gardens. They knew the Earth revolved around the Sun and was spherical. Way back, maybe not "these folks" as in the writers of the Bible.
Today if people hear voices from God, others mainly think they're nuts. Back then I'd guess it was similar.
Don't get me wrong, I know people have experiences and don't doubt their experiences, maybe I doubt their interpretations etc. But the majority of us discount that type of thing without thought.