If I know something, and I'm reasonably sure it's true, but it isn't deeply connected to my hopes and my idea of who I am, I may find myself thinking about this reasonably sure thing without expecting to be thinking about it. It may just pop up. I may tweak what I think about it, or occasionally, change what I think about it a lot.

If I deeply know something down to my heart and what I assume to be the basis of my life, I tend to put it in the no-think zone. So even if it's basically pretty sound, this deeply known thing gets dated, stays the way it was when I started knowing it.

If the deeply known something is basically unsound, and I never think about it, no matter how intelligently I think about stuff I care less about, I am stupic at the core.