Belief.

Matthew 13v54-58
and coming to his hometown he taught them in their synagogue, so that they were astonished, and said, “Where did this man get this wisdom and these mighty works? Is not this the carpenter’s son? Is not his mother called Mary? And are not his brothers James and Joseph and Simon and Judas? And are not all his sisters with us? Where then did this man get all these things?” And they took offense at him. But Jesus said to them, “A prophet is not without honor except in his hometown and in his own household.” And he did not do many mighty works there, because of their unbelief.

Jesus doesn’t display his power in places of unbelief.