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?
      Secondly,  The  public instructions  which were to be given to the children of men, in what way, and upon what terms, they might obtain salvation by Christ; and this is the  covenant of grace  between God and man. Who the particular persons were that were given to Christ is a  secret: The Lord knows them that are his,  we do not, nor is it fit we should; but, though their names are concealed, their characters are published. An offer is made of life and happiness upon gospel terms, that by it those that were given to Christ might be brought to him, and others left inexcusable (; John 6:40): "This is the will,  the revealed will,  of him that sent me,  the method agreed upon, upon which to proceed with the children of men, that  every one,  Jew or Gentile, that  sees the Son, and believes on him,  may have  everlasting life,  and  I will raise him up." This is  gospel  indeed, good news. Is it now reviving to hear this? 1. That  eternal life  may be had, if it be not our own fault; that whereas, upon the sin of the first Adam, the  way of the tree of life  was blocked up, by the grace of the second Adam it is laid upon again. The crown of glory is set before us as the prize of our high calling, which we may run for and obtain. 2. Every one may have it. This gospel is to be preached, this offer made, to all, and none can say, "It belongs not to me,"  Revelation 22:17. 3. This everlasting life is sure to all those who believe in Christ, and to them only. He that  sees the Son,  and  believes on him,  shall be saved. Some understand this  seeing  as a  limitation  of this condition of salvation to those only that have the revelation of Christ and his grace made to them. Every one that has the opportunity of being acquainted with Christ, and improves this so well as to  believe  in him, shall have everlasting life, so that none shall be condemned for unbelief (however they maybe for other sins) but those who have had the gospel preached to them, who, like these Jews here (; John 6:36), have  seen,  and yet have  not  believed; have known Christ, and yet not trusted in him. But I rather understand  seeing  here to mean the same thing with  believing,  for it is  theoron, which signifies not so much the sight of the eye (as  John 6:36,  heorakate me—ye have seen me) as the  contemplation of the mind.  Every one thatsees the Son,  that is,  believes on him,  sees him with an eye of faith, by which we come to be duly acquainted and affected with the doctrine of the gospel concerning him. It is to look upon him, as the stung Israelites upon the brazen serpent. It is not a  blind  faith that Christ requires, that we should be willing to have our  eyes put out,  and then follow him, but that we should  see him,  and see what ground we go upon in our faith. It is  then  right when it is not taken up upon  hearsay  (believing as the church believes), but is the result of a due consideration of, and insight into, the motives of credibility:  Now mine eye sees thee. We have heard him ourselves.  4. Those who believe in Jesus Christ, in order to their having everlasting life, shall be raised up by his power at the last day. He had it in charge as his Father's will (; John 6:39), and here he solemnly makes it his own undertaking: I  will raise him up,  which signifies not only the return of the body to life, but the putting of the  whole man  into a full possession of the eternal life promised.