But Jesus answered them, "My Father is still working, so I am working, too."
And I work ...  By this, Jesus affirmed that he was doing exactly what God was doing.  The Father had never ceased to work in the support and maintenance of all things, and therefore the Lord was in full character with the Father when he healed a man on the sabbath day.  Furthermore, no sabbath regulation of any divine sanction had ever forbidden such an act.