Murder is bad. Killing your tribesmen weakens the tribe, thus lowering your chances of survival.
"For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack."
English
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Where tf is that quote from? seems familiar
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Originally, it's from The Jungle Book. If it isn't, I have no clue where it originates from before being used in The Jungle Book. Bungie used it and a bit more of the passage it comes from in an advertisement for Destiny.