I don't particularly like the wording in this translation of the verse...as my understanding of it was that the meaning was to more indicate, "those who live by the sword die by it". I think some take up the sword....they use it, they carry one for a purpose at some point, etc....But on the other hand, like the Samurai, some 'live' by the sword. That way of life is what they worship, it get's the majority of their attention. They'll live in strife and violence, or in search of it....