They said therefore to him, "What then do you do for a sign, that we may see, and believe you? What work do you do?
      a.  For  their  conviction and awakening, plainly intimating that their not coming to him, and believing on him, if they persisted in it, would be a certain sign that they did not belong to the election of grace; for how can we think that God gave us to Christ if we give ourselves to the world and the flesh?  ; 2 Peter 1:10.