Remember that old game? Sitting around, say in kindergarten, and somebody asks, "Hey, can you pat your head while rubbing your tummy?"
Before long, the entire room is trying to pat their head while rubbing their tummy. What the heck does that have to do with A Course in Miracles you ask?
Well, it occurs to me that this exercise requires that we think about it. We're not wired up to automatically pat our heads while rubbing our tummies! It causes us to stop and think!
The same thing goes for A Course in Miracles. The thought system of the Holy Spirit does not necessarily come naturally, at least not at first. If it did then we wouldn't need A Course in Miracles.
In the beginning, it certainly requires that we think about it. The more we think about it and apply it to our daily lives, the more natural and automatic it becomes. I'm still in the beginning, apparently, because I still need to think about it, and think about it, and think about it...
And I'm still thinking about it!