It is an extraordinary question! What sign do you show? That was a sign, a tremendous sign, something they had never seen: one man with a little token whip and a powerful word driving all these resistant, reluctant tradesmen out of the temple court. What they are showing is their wilful blindness, their determination not to recognise any sign, not to grasp for a moment that one is among them who is at the very least a prophet from God, and who may be the Messiah.