Rudyard Kipling 
The Second Jungle Book [EPUB ebook] 

The Law of the Jungle-which is by far the oldest law in the world-has arranged for almost every kind of accident that may befall the Jungle People, till now its code is as perfect as time and custom can make it. You will remember that Mowgli spent a great part of his life in the Seeonee Wolf-Pack, learning the Law from Baloo, the Brown Bear; and it was Baloo who told him, when the boy grew impatient at the constant orders, that the Law was like the Giant Creeper, because it dropped across every one’s back and no one could escape. ‚When thou hast lived as long as I have, Little Brother, thou wilt see how all the Jungle obeys at least one Law. And that will be no pleasant sight, ‚ said Baloo.