"yes, but, not being God, I cannot turn my tongue into a sword...

The quote from John does not seem applicable."

Ah, but you're very points show it's applicability. The trick is you don't need to turn you're tongue into a sword or even carry one for God to achieve his purpose. In your first quote, Jesus was speaking metaphorically, warning his disciples to expect tough times ahead. The Twelve always were a little dense, you know. When they tell Jesus that they have two swords in the following verse, I've always pictured him shaking his head in disbelief at their literalness and saying, "That is enough". In truth two swords were really more than enough. Didn't need them at all.