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?
      First,  The  private instructions  given to Christ, that he should be sure to save all the chosen remnant; and this is the  covenant of redemption  between the Father and the Son (John 6:38): "This is the Father's will, who hath sent me;this is the charge I am entrusted with, that  of all whom he hath given me I should lose none." Note, 1. There is a certain number of the children of men  given  by the Father to Jesus Christ, to be his care, and so to be to him for a name and a praise; given him for  an inheritance,  for a possession. Let him do all that for them which their case requires; teach them, and heal them, pay their debt, and plead their cause, prepare them for, and preserve them to, eternal life, and then let him make his best of them. The Father might dispose of them as he pleased: as creatures, their lives and beings were  derived from  him; as sinners, their lives and beings were  forfeited to him.  He might have sold them for the satisfaction of his justice, and delivered them  to the tormentors;  but he pitched upon them to be the monuments of his mercy, and delivered them to the Saviour. Those whom God chose to be the objects of his special love he lodged as a trust in the hands of Christ. 2. Jesus Christ has undertaken that he will  lose none  of those that were thus  given him  of the Father. The  many sons  whom he was to  bring to glory  shall all be forth-coming, and none of them missing,  ; Matthew 18:14. None of them shall be lost, for want of a sufficient grace to sanctify them.  If I bring him not unto thee, and set him before thee, then let me bear the blame for ever,  Genesis 43:9. 3. Christ's undertaking for those that are given him extends to the resurrection of their bodies.  I will raise it up again at the last day,  which supposes all that goes before, but this is to crown and complete the undertaking. The body is a part of the man, and therefore a part of Christ's purchase and charge; it pertains to the promises, and therefore it shall not be  lost.  The undertaking is not only that he shall  lose none,  no  person,  but that he shall  lose nothing,  no part of the person, and therefore not the body. Christ's undertaking will never be accomplished till the resurrection, when the souls and bodies of the saints shall be re-united and gathered to Christ, that he may present them to the Father:Behold I, and the children that thou has given me,  ; Hebrews 2:13; 2 Timothy 1:12. 4. The spring and original of all this is thesovereign will of God,  the counsels of his will, according to which he works all this. This was the commandment he gave to his Son, when he sent him into the world, and to which the Son always had an eye.