Jesus answered them, “This is the work of God, that you believe in him whom he has sent.”
The Assumption Hidden in the Question
Jesus had just fed the crowd, and now they ask Him for a list of works to do. Their question assumes something about themselves that He never grants.
William KellyThey said to Him, "What must we do, to be doing the works of God?" Jesus answered them, "This is the work of God, that you believe in Him whom He has sent." So, as He spoke clearly, they show their deep-rooted assumption once more. People in every state and age and country take it for granted that fallen man can work the works of God. They ignore their own sin, His holiness and majesty. It was the way of Cain; and the professing Christian world is as infected with it as Judaism or paganism.
One Work, Not Many
They asked about "works," plural. He answered with one.
C. E. StuartGod asked for faith: believing in the Lord Jesus, the One He sent. He did not ask for activity in works, or for an offering brought to the altar in the Temple court. So God asked nothing beyond what a man could do. Not works, but faith, was the work of God for them.
The chapter also attaches a picture to that one work.
Samuel RidoutThey ask then what they might do, and our Lord tells them there is but one work of God for them. It is to "believe in Him whom He has sent." He is the true Bread. So to believe in Him is to eat that Bread which has come down from heaven.
Why Faith and Not Labour
Calling faith a "work" could sound like a loophole — as though believing were a small task that earns the wage.
William KellySo the principle is clear. To the man who works, God counts the reward as a debt, not as grace. But the man who does not work, and instead believes in Him who justifies the ungodly — God counts his faith as righteousness. Man may be fully and securely blessed, but it is only of grace, and so by faith, which gives the glory to God, as itself His gift. So faith is the work of God, and it shuts out man's working. It does not shut out works as the fruit of faith, for faith produces plenty of good works. It shuts out any work that comes before faith or stands level with it.
Behind their question lay a wrong picture of God.
Hamilton SmithThey knew neither their own helplessness nor God's grace, so they thought of God as One who makes demands of man. They had yet to learn that the grace of God does not demand works to get the blessing. It only asks that man should believe in the One Whom He has sent. Works would follow faith.
The Person Faith Rests On
Faith here has a named Person as its object. The Father Himself has already marked that Person out.
W. TrotterIs He the One whom God the Father, of all who ever walked this earth, counted worthy to seal? How clear, then, that to believe in Him is what God must approve. Without that faith, God can accept nothing else.
The word "sent" carries weight of its own. It points back to a relationship that already existed before He came.
William J. HockingThese words clearly imply that the relationship of Father existed before He, the Son, came out from Him. The same relationship, before He became man, stands revealed in the Lord's frequent saying that the Father sent Him, the Son. See John 5:30, 37 and John 6:29. The sense of these passages is plain and unmistakable, and it needs no forcing: the Lord came out from the One Who was the Father, and came into the world.
Believing That Is More Than Agreeing
If faith is God's work, then God must produce it.
Scripture QuarterlyThe work of God is to believe in Him whom God has sent. That belief, produced by the Holy Spirit, brings life and salvation. (There is also a belief which is purely mental!) ... The Holy Spirit is brooding over the darkness and chaos in the souls of men. He works in a moral way, awakening them to their true condition before God. The result is a new condition which answers to God.
Summary
- Assumption. The question "What must we do?" already carries the error. It assumes that fallen man can work the works of God.
- Answer. Christ reduces the plural to a singular: there is one work of God for them, and it is to believe in the One He sent.
- Grace. To the worker, wages are a debt. To the believer, God counts faith as righteousness. So the blessing stays a gift, and the glory stays God's.
- Object. Faith is not a feeling. It rests on a Person: the One the Father sealed, who came out from the Father before He came into the world.
- Result. There is a belief that is only mental. But the faith God works brings life, and good works follow it rather than earn it.