The knife. It is a simple form that has been around a long time.
It has many uses: opening bags of seed, meal prep, extracting splinters, prying staples, cleaning teeth, sharpening pencils, cutting zip ties, removing gum from hair.
But it is also true that the blade has been used to kill many a man.
So which is it, a tool or a weapon? It depends on the handler. The hand holding the knife decides the outcome.
What is man then? A tool or a weapon? Again it depends on who is holding the man. If he is bent on ruling himself, his strength will inevitably bring harm. Just look at history. But if he is yielded to God, his strength can help fix the world.