But the testimony which I have is greater than that of John, for the works which the Father gave me to accomplish, the very works that I do, testify about me, that the Father has sent me.

 In the preceding passage Jesus has claimed the right of judgment. It was not unnatural that men should ask by what right he proposed to judge others. His answer was that his judgment was true and final because he had no desire to do anything other than the will of God. His claim was that his judgment was the judgment of God. 