Jesus enlightens every man

"[The man] ... answered [Jesus] : ​​Master, I have kept all this from my youth. Jesus, looking at him, loved him, and said to him : "One thing is wanting : go, sell all that you have, give to the poor, and you will have a treasure in heaven ; And come, follow me. And he, dismayed by this word, went away sad, for he had great possessions. "Mark 10: 20-22

"The true light was that which, coming into the world, enlightens every man." John 1: 9

 
This encounter puts Jesus face to face with what is usually called the rich young man. He was a Jew, zealous for God and obedient to the Law.
This man adopts a known behavior : he considers eternal life as a good that can be acquired by good conduct. He comes to see Jesus in whom he recognizes a guide. His question shows that he wishes to take stock of his spiritual situation (Mark 10:17).
In dialogue, Jesus reveals Himself as light and enlightens Him on His condition. It causes him to take a different look at himself and all men. He reminds him that man can never really reach good : "No one is good, but only one : God" (Mark 10:18).
This young man carefully observes the Law but has a real problem : he is more attached to money than to God. To highlight it, Jesus gives an unusual injunction : "Go, sell all that you have ... and come, follow me" (v.21).
The Lord enlightens this man, reveals the reason for his anxiety, while showing him a deep interest : he looks at him, he loves him, but leaves him free of his choice. Unable to obey because he is still attached to his possessions, the young man goes away sad.
By asking this man to sell all that he possesses, Jesus does not teach that this act is a means of salvation. He tries to persuade him that he needs to be saved and that for this he must give up what keeps him from following him.
It has been said : It is easier to do without what one has than to detach oneself from what one possesses ! It is so today. We need a clear look at what we are and what we are attached to.
It is the action of the Spirit that will make light in our hearts.
 
Source (Please the Lord)