I did one work

Though Christ did so many wonderful miracles, he highlighted one particular work in John 7:21, what work that Christ himself emphasizing?  

21 Jesus answered them, I did one work, and you all marvel at it. 

22 Moses gave you circumcision (not that it is from Moses, but from the fathers), and you circumcise a man on the Sabbath. 

23 If on the Sabbath a man receives circumcision, so that the law of Moses may not be broken, are you angry with me because on the Sabbath I made a man's whole body well? 

24 Do not judge by appearances, but judge with right judgment - John 7

The answer is hidden in John 7:23, that is about healing the sinful man giving him a new heavenly body, for that very purpose Christ shed his blood on the Cross and rested on the Sabbath day. And later the Spirit of God explained this in detail through Apostle Paul.

47 The first man was from the earth, a man of dust; the second man is from heaven. 

48 As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. 

49 Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven.

50 I tell you this, brothers: flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable. 

51 Behold! I tell you a mystery. We shall not all sleep, but we shall all be changed -1 Corinthians 15

Come to Jesus Christ, and receive the forgiveness of God and be part of the Resurrection.