I'm confused about something. I keep seeing people referring to "sitting with" something, a problem or idea or whatever. How exactly does one do that? I generally try to think about nothing while I'm on the zafu. If a thought comes up, I just let it go and try to "think nonthinking". When you "sit with" something, do you bring your attention back to what you are "sitting with" or is it more of a background thing? Any input would be helpful.