The strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.

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.

– Rudyard Kipling

http://www.goodreads.com/quotes/69550-now-this-is-the-law-of-the-jungle—-as