"Now this is the Law of the Jungle—as old and as true as the sky;

And the wolf that shall keep it may prosper, but the wolf that shall break it must die.

As the creeper that girdles the tree-trunk, the Law runneth forward and back;

For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack."

--In the novel The Jungle Book, Rudyard Kipling--