Why The Sword?

In Luke's Passion, chapter 22: 36-37, Jesus says his followers will need a sword and sell their coat to get one.  It is a metaphor.  The sword divides.  The disciples must be willing to talk about the cross.  This will divide the community.  Some will reject Jesus outright. Some will say that he did not really suffer but only looked like he was suffering.  The cross is like a sword that divides.  You cannot proclaim Christ without the cross.  What about the coat?  It stands for the outer garment that represents the desire for power.  People of power always dress up, e.g. royalty and Cardinals.  The disciples must let go of this desire for power.  Preach the cross and people will be unhappy with you.  The sword of the gospel can reveal hidden and selfish motives for becoming  Christian.