Planes

We have in fact reached the point of intersection of two different planes: of a real and permanent, and an unreal and passing world of values: morals on the one hand, and on the other a code of honour, or a game with rules. The personal code of most people was, and of many still is, like that of Sir Gawain made up of a close blend of the two; and breaches at any point in that personal code have a very similar emotional flavour. Only a crisis, or serious thought without a crisis (which is rare) will serve to disentangle the elements; and the process may be painful, as Gawain discovered.

—J.R.R. Tolkien, Gawain and the Green Knight.