Law of the jungle

"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."

From ‘The Law of the Jungle’ by Rudyard Kipling