The mind's cross indexing puts the best librarian to shame.
The conscious act of thinking about one's thoughts in a different way changes the very brain circuits that do that thinking.
The mind, of course, is just what the brain does for a living.
With modern parts atop old ones, the brain is like an iPod built around an eight-track cassette player.
Arguing, after all, is less about seeking truth than about overcoming opposing views.
Like sand on the beach, the brain bears the footprints of the decisions we have made, the skills we have learned, the actions we have taken.