From: Mark 10:17-27 (or Mark 10:17-30)
The Rich Young Man
 And as He (Jesus) was setting out on His journey, a man ran up and knelt before Him, and asked Him, "Good Teacher, what must I do to inherit eternal life?"  And Jesus said to him, "Why do you call Me good? No one is good but God alone.  You know the commandments: `Do not kill, Do not commit adultery, Do not steal, Do not bear false witness, Do not defraud, Honor your father and mother.'"  And he said to Him, "Teacher, all these I have observed from my youth."  And Jesus looking upon him loved him, and said to him, "You lack one thing; go, sell what you have, and give to the poor, and you will have treasure in Heaven; and come, follow Me."  At that saying his countenance fell, and he went away sorrowful; for he had great possessions.
Poverty and Renunciation
 And Jesus looked around and said to His disciples, "How hard it will be for those who have riches to enter the Kingdom of God!"  And the disciples were amazed at His words. But Jesus said to them again, "Children, how hard it is for those who trust in riches to enter the Kingdom of God!"  It is easier for a camel to go through the eye of a needle than for a rich man to enter the Kingdom of God."  And they were exceedingly astonished, and said to Him, "Then who can be saved?"  Jesus looked at them and said, "With men it is impossible, but not with God; for all things are possible with God."  Peter began to say to Him, "Lo, we have left everything and followed You."  Jesus said, "Truly, I say to you, there is no one who has left house or brothers or sisters or mother or father or children or lands, for My sake and for the Gospel,  who will not receive a hundredfold now in this time, houses and brothers and sisters and mothers and children and lands, with persecutions, and in the age to come eternal life."
17-18. As Matthew 19:16 makes clear, the young man approaches Jesus as an acknowledged teacher of the spiritual life, in the hope that He will guide him towards eternal life. It is not that Christ rejects the praise He is offered: He wants to show the depth of the young man's words: He is good, not because He is a good man but because He is God, who is Goodness Itself. So, the young man has spoken the truth, but he has not gone far enough. Hence the enigmatic nature of Jesus' reply and its profundity. The young man's approach is upright but too human; Jesus tries to get him to see things from an entirely supernatural point of view. If this man is to really attain eternal life he must see in Christ not just a good master but the divine Savior, the only Master, the only one who, because He is God, is Goodness Itself. Cf. note on Mt. 19:16-22.
19. Our Lord has not come to abolish the Law but to fulfill it (Matthew 5:17). The commandments are the very core of the Law and keeping them is necessary for attaining eternal life. Christ brings these commandments to fulfillment in a double sense. First, because He helps us discover their full implications for our lives. The light of Revelation makes it easy for us to grasp the correct meaning of the precepts of the Decalogue--something that human reason, on its own, can only achieve with difficulty. Second, His grace gives us strength to counter our evil inclinations, which stem from Original Sin. The commandments, therefore, still apply in the Christian life: they are like signposts indicating the way that leads to Heaven.
21-22. Our Lord knows that this young man has a generous heart. This is why He treats him so affectionately and invites him to greater intimacy with God. But He explains that this means renunciation--leaving his wealth behind so as to give his heart whole and entire to Jesus. God calls everyone to holiness, but holiness is reached by many different routes. It is up to every individual to take the necessary steps to discover which route God wants him to follow. The Lord sows the seed of vocation in everyone's soul, to show him the way to go to reach the goal of holiness, which is common to all.
In other words, if a person does not put obstacles in the way, if he responds generously to God, he feels a desire to be better, to give himself more generously. As fruit of this desire he seeks to know God's will; he prays to God to help him, and asks people to advise him. In responding to this sincere search, God uses a great variety of instruments. Later, when a person thinks he sees the way God wants him to follow, he may still not take the decision to go that way: he is afraid of the renunciation it involves: at this point he should pray and deny himself if the light--God's invitation--is to win out against human calculation. For, although God is calling, man is always free, and therefore, he can respond generously or be a coward, like the young man we are told about in this passage. Failure to respond generously to one's vocation always produces sadness.
21. "In its precise eloquence", John Paul II points out, commenting on this passage, "this deeply penetrating event expresses a great lesson in a few words: it touches upon substantial problems and basic questions that have in no way lost their relevance. Everywhere young people are asking important questions--questions on the meaning of life, on the right way to live, on the scale of values: `What must I do...?' `What must I do to share in everlasting life?'...To each of you I say therefore: heed the call of Christ when you hear him saying to you: `Follow Me!' Walk in My path! Stand by My side! Remain in My love! There is a choice to be made: a choice for Christ and His way of life, and His commandment of love.
"The message of love that Christ brought is always important, always relevant. It is not difficult to see how today's world, despite its beauty and grandeur, despite the conquests of science and technology, despite the refined and abundant material goods that it offers, is yearning for more truth, for more love, for more joy. And all of this is found in Christ and in His way of life.... Faced with problems and disappointments, many people will try to escape from their responsibility: escape in selfishness, escape in sexual pleasure, escape in drugs, escape in violence, escape in indifference and cynical attitudes. But today, I propose to you the option of love, which is the opposite of escape. If you really accept that love from Christ, it will lead you to God. Perhaps in the priesthood or religious life; perhaps in some special service to your brothers and sisters: especially to the needy, the poor, the lonely, the abandoned, those whose rights have been trampled upon, or those whose basic needs have not been provided for. Whatever you make of your life, let it be something that reflects the love of Christ" ("Homily on Boston Common").
22. "The sadness of the young man makes us reflect. We could be tempted to think that many possessions, many of the goods of this world, can bring happiness. We see instead in the case of the young man in the Gospel that his many possessions had become an obstacle to accepting the call of Jesus to follow Him. He was not ready to say "yes" to Jesus and "no" to self, to say "yes" to love and "no" to escape. Real love is demanding. I would fail in my mission if I did not clearly tell you so. For it was Jesus--Jesus Himself--who said: `You are My friends if you do what I command you' (John 15:14). Love demands effort and a personal commitment to the will of God. It means discipline and sacrifice, but it also means joy and human fulfillment.
"Dear young people: do not be afraid of honest effort and work; do not be afraid of the truth. With Christ's help, and through prayer, you can answer His call, resisting temptations and fads, and every form of mass manipulation. Open your hearts to the Christ of the Gospels--to His love and His truth and His joy. Do not go away sad!...
"Follow Christ! You who are single or who are preparing for marriage. Follow Christ! You who are young or old. Follow Christ! You who are sick or aging; who are suffering or in pain. You who feel the need for healing, the need for love, the need for a friend--follow Christ!
"To all of you I extend--in the name of Christ--the call, the invitation, the plea: `Come and follow Me'" (John Paul II, "Homily on Boston Common").
23-27. The reaction of the rich young man gives our Lord another opportunity to say something about the way to use material things. In themselves they are good: they are resources God has made available to people for their development in society. But excessive attachment to things is what makes them an occasion of sin. The sin lies in "trusting" in them, as if they solve all life's problems, and turning one's back on God. St. Paul calls covetousness idolatry (Colossians 3:5). Christ excludes from the Kingdom of God anyone who becomes so attached to riches that his life is centered around them. Or, more accurately, that person excludes himself.
Possessions can seduce both those who already have them and those who are bent on acquiring them. Therefore, there are--paradoxically--poor people who are really rich, and rich people who are really poor. Since absolutely everyone has an inclination to be attached to material things, the disciples see salvation as an impossible goal: "Then who can be saved?" No one, if we rely on human resources. But God's grace makes everything possible. Cf. note on Matthew 6:11.
Also, not putting our trust in riches means that everyone who does have wealth should use it to help the needy. This "demands great generosity, much sacrifice and unceasing effort on the part of the rich man. Let each one examine his conscience, a conscience that conveys a new message for our times. Is he prepared to support out of his own pocket works and undertakings organized in favor of the most destitute? Is he ready to pay higher taxes so that the public authorities can intensify their efforts in favor of development?" (Paul VI, "Populorum Progressio", 47).
28-30. Jesus Christ requires every Christian to practise the virtue of poverty: He also requires us to practise real and effective austerity in the possession and use of material things. But of those who have received a specific call to apostolate-- as in the case, here, of the Twelve--He requires absolute detachment from property, time, family, etc. so that they can be fully available, imitating Jesus Himself who, despite being Lord of the universe, became so poor that He had nowhere to lay His head (cf. Matthew 8:20). Giving up all these things for the sake of the Kingdom of Heaven also relieves us of the burden they involve: like a soldier shedding some encumbrance before going into action, to be able to move with more agility. This gives one a certain lordship over all things: no longer the slave of things, one experiences that feeling St. Paul referred to: "As having nothing, and yet possessing everything" (2 Corinthians 6:10). A Christian who sheds his selfishness in this way has acquired charity and, having charity, he has everything: "All are yours; you are Christ's; and Christ is God's" (1 Corinthians 3:22-23).
The reward for investing completely in Christ will be fully obtained in eternal life: but we will also get it in this life. Jesus says that anyone who generously leaves behind his possessions will be rewarded a hundred times over in this life.
He adds "with persecutions" (v. 30) because opposition is part of the reward for giving things up out of love for Jesus Christ: a Christian's glory lies in becoming like the Son of God, sharing in His cross so as later to share in His glory: "provided we suffer with Him in order that we may also be glorified with Him (Romans 8:17); "all who desire to live a godly life in Christ Jesus will be persecuted' (2 Timothy 3:12).
29. These words of our Lord particularly apply to those who by divine vocation embrace celibacy, giving up their right to form a family on earth. By saying "for My sake and for the Gospel" Jesus indicates that His example and the demands of His teaching give full meaning to this way of life: "This, then, is the mystery of the newness of Christ, of all that He is and stands for; it is the sum of the highest ideals of the Gospel and of the Kingdom; it is a particular manifestation of grace, which springs from the paschal mystery of the Savior and renders the choice of celibacy desirable and worthwhile on the part of those called by our Lord Jesus. Thus, they intend not only to participate in Christ's priestly office, but also to share with Him His very condition of living" (Paul VI, "Sacerdotalis Coelibatus", 23).
Source: "The Navarre Bible: Text and Commentaries". Biblical text taken from the Revised Standard Version and New Vulgate. Commentaries made by members of the Faculty of Theology of the University of Navarre, Spain. Published by Four Courts Press, Kill Lane, Blackrock, Co. Dublin, Ireland. Reprinted with permission from Four Courts Press and Scepter Publishers, the U.S. publisher.