In its simplest form, the “work” that Jesus came to do was to save the world. He could have done that by going straight to the cross, dying and being resurrected. But there were many things that God wanted Him to do while He was here. This work included miracles to draw people to God. It also included living a sinless life as an example for us to follow. Just as the work that Jesus did included more than death and resurrection, “the only work God wants from you” is to “believe the One He has sent” includes more than just believing. But believing is the first step and if you don’t believe and receive the Holy Spirit, you will not be able to do the rest of the work.
36 When he saw the crowds, he had compassion on them because they were confused and helpless, like sheep without a shepherd. 37 He said to his disciples, “The harvest is great, but the workers are few. 38 So pray to the Lord who is in charge of the harvest; ask him to send more workers into his fields.”—Matthew 9:36-38 (NLT)