Watching the lines on the road drift by in typical, endless succession inspired my walnut of a mind for a moment, perhaps, and this simple thinking-like-a-mac-user type phrase came to mind: Be pretty.
I like it.
There are the Bob Jones-style quotes, "Do right," and "Know thyself." Short, two-worders that'll stick with you. Be pretty sums up, to me, the essence of "pretty is as pretty does." Don't only desire to look pretty, be pretty.