Most of the time, your thinking is driven from one of two places. The world outside: news, messages, other people's moods. Or the world inside: old memories, replayed conversations, the stories that go round and round.
The course this comes from names a third place the mind can live. Beyond both, it describes a dimension of complete silence, a home of light: your original home, the course says, and where God is. In thought, it says, you can go there, rest a while, and come back to your day more like a guest in it than a captive of it. One of its teachers describes sitting there and feeling seen as you originally were, not as your list of mistakes. Self-respect starts to return, and with it the strength to be patient, to let go, to forgive.
The difficulty is that the first two worlds are loud and this one is quiet. It won't compete for your attention. You have to choose it, briefly and often.