"And Jesus, looking at him, loved him, and said to him, 'You lack one thing: go, sell all that you have and give to the poor, and you will have treasure in heaven; and come, follow me.'"
Jesus wasn't kidding. He wasn't testing him or trying to turn him into an object lesson. This wasn't even the first time Jesus had said, "Come, follow me.", however it is the first time the phrase isn't followed by "And immediately they got up and left everything and followed him." in Mark's account. What made him so different?
The reason Jesus calls us all to leave everything behind and then follow him is so that we have nothing to turn back to. When you follow Jesus, you quickly realize just as Peter did when he said, "Lord, to whom shall we go? You have the words of eternal life." Think well before you commit your life to Christ and count the cost. How foolish does a Christian look who falls from the faith! He started to build what he could not finish.
In truth, no one who claims to follow Jesus and yet hangs onto material wealth is actually a disciple. You cannot serve both God and Money. If you do not consider all things as rubbish when compared to the value of knowing the Lord then you do not realize His value in your life. He is no fool who gives up what he cannot keep to gain what is eternal.