Then they asked him, "What must we do to do the works that God requires?"
Perhaps they had this passage from the Old Testament in mind "Whoever loves money never has enough; Whoever loves wealth is never satisfied with their income. This too is meaningless. As goods increase, so do those who consume them. And what benefit are they to the owners except to feast their eyes on them? The sleep of a laborer is sweet, whether they eat little or much, but as for the rich, their abundance permits them no sleep."
But they misunderstand the meaning of 'work'. Jesus replies, "The work of God is this: to believe the one he has sent."
Over and over we are told that the greatest sin is unbelief. To believe we need humility. It takes a lot for modern man to put away his pride in his own ability and to surrender to God. Look at the story of Job. It took a demonstration of God's creativity for him to stop justifying himself. Today most people no longer believe in a Creator God; foolishly they put it down to evolution. Instead we must point to the wickedness of the world and demonstrate the solution that Jesus has brought. We must still believe in the miraculous, though.