My grandparents were Quakers. I've been to a few of their meetings. A Quaker meeting consists of everyone in the congregation sitting silently in a room, with individuals standing up to speak at irregular and unplanned intervals. In my experience, when people stand up to speak, they talk about the things that are important in their "spiritual" lives, which, in practice, means their emotional/moral lives. God was mentioned only in passing, and, aside from these mentions of God, I don't remember anything mystical.