in reply to Spirit of the Monastery

There should also be a reference to the game of Cricket, which includes, in the actual "Laws" (the official rulebook of the International Cricket Council), a clause about the Spirit of Cricket:

Cricket is a game that owes much of its unique appeal to the fact that it should be played not only within its Laws but also within the Spirit of the Game. Any action which is seen to abuse this spirit causes injury to the game itself.

Principle of Least Astonishment: Any language that doesn’t occasionally surprise the novice will pay for it by continually surprising the expert