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?
      (3.) He shows what encouragements we have to believe in Christ. Christ here speaks of some who  had seen him and yet believed not,  ; John 6:36. They saw his person and miracles, and heard him preach, and yet were not wrought upon to believe in him. Faith is not always the effect of sight; the soldiers were eye-witnesses of his resurrection, and yet, instead of  believing  in him, they  belied  him; so that it is a difficult thing to bring people to believe in Christ: and, by the operation of the Spirit of grace, those that  have not seen have yet believed.  Two things we are here assured of, to encourage our faith:—