1 When Jesus had finished saying these things, he left Galilee and went into the region of Judea to the other side of the Jordan. 2 Large crowds followed him, and he healed them there.
3 Some Pharisees came to him to test him. They asked, Is it lawful for a man to divorce his wife for any and every reason?
4 Havent you read, he replied, that at the beginning the Creator made them male and female, 5 and said, For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh? 6 So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.
7 Why then, they asked, did Moses command that a man give his wife a certificate of divorce and send her away?
8 Jesus replied, Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning. 9 I tell you that anyone who divorces his wife, except for sexual immorality, and marries another woman commits adultery.
10 The disciples said to him, If this is the situation between a husband and wife, it is better not to marry.
11 Jesus replied, Not everyone can accept this word, but only those to whom it has been given. 12 For there are eunuchs who were born that way, and there are eunuchs who have been made eunuchs by othersand there are those who choose to live like eunuchs for the sake of the kingdom of heaven. The one who can accept this should accept it.
Up until now, the majority of the Lord's ministry had been among Jews in the Galilee. (Although He would go into Jerusalem for the required feasts.) Now, He is leaving the Galilee for the last time before His death and resurrection. He entered into Judea. The other gospels (Mark & Luke) give more details about His work in that area, however, Matthew's gospel was written primarily to the Jews and he continued to record the ministry where it concerned the Jews.
The Pharisees could see the large crowd following Jesus and saw His popularity. They wanted to turn the people against them. This is why they asked the question about divorce. At that time, many allowed divorce for many reasons. (Even King Herod had divorced his wife to marry his brother's wife. John the Baptist had said that this was sin and was eventually beheaded for it.) Moses had said that a man could divorce his wife in case of adultery but many were divorcing their wives for many reasons other than adultery. If Jesus spoke out against divorce, it would surely anger men who had gotten such a divorce. Jesus saw the trick (or test) so He answered with what God had intended with marriage--that once a couple got married that they would become "one" and nothing should separate them. The Pharisees then asked about Moses saying that divorce was okay. They knew that if Jesus said that Moses was wrong then the people would turn against Jesus since Moses had "given the law". Jesus answered that Moses had only made a concession because of the peoples' hard hearts. And that divorce should only allowed in case of adultery.
The disciples asked if then it would be better if a man would not marry (if he could not divorce his wife for reasons other than adultery). Jesus answered that not every man would be able to "accept this word" (that it's better not to marry). He gave examples of where man would not be married either because of physical impairment or because they were dedicating their lives to God.
13 Then people brought little children to Jesus for him to place his hands on them and pray for them. But the disciples rebuked them.
14 Jesus said, Let the little children come to me, and do not hinder them, for the kingdom of heaven belongs to such as these. 15 When he had placed his hands on them, he went on from there.
In Jesus' time, children were considered insignificant. They were often neglected. Even the disciples tried to keep the children from "wasting" our Lord's time. Jesus, on the other hand, showed that He considered children to be very important. He even went so far as to say that the kingdom of heaven belongs to them and people who like them. Children are accepting and will believe almost anything. They trust--have faith--in what is taught to them. It's only later that they develop skepticism. The death, resurrection, and payment for sins is difficult to understand. Although we don't have to "leave our brains at the door when we become Christians" (as some people believe) there is a point where we realize that we can't understand everything exactly, we have to trust (have faith) in the word of our Father.
16 Just then a man came up to Jesus and asked, Teacher, what good thing must I do to get eternal life?
17 Why do you ask me about what is good? Jesus replied. There is only One who is good. If you want to enter life, keep the commandments.
18 Which ones? he inquired.
Jesus replied, You shall not murder, you shall not commit adultery, you shall not steal, you shall not give false testimony, 19 honor your father and mother,[c] and love your neighbor as yourself.[d]
20 All these I have kept, the young man said. What do I still lack?
21 Jesus answered, If you want to be perfect, go, sell your possessions and give to the poor, and you will have treasure in heaven. Then come, follow me.
22 When the young man heard this, he went away sad, because he had great wealth.
23 Then Jesus said to his disciples, Truly I tell you, it is hard for someone who is rich to enter the kingdom of heaven. 24 Again I tell you, it is easier for a camel to go through the eye of a needle than for someone who is rich to enter the kingdom of God.
25 When the disciples heard this, they were greatly astonished and asked, Who then can be saved?
26 Jesus looked at them and said, With man this is impossible, but with God all things are possible.
27 Peter answered him, We have left everything to follow you! What then will there be for us?
28 Jesus said to them, Truly I tell you, at the renewal of all things, when the Son of Man sits on his glorious throne, you who have followed me will also sit on twelve thrones, judging the twelve tribes of Israel. 29 And everyone who has left houses or brothers or sisters or father or mother or wife[e] or children or fields for my sake will receive a hundred times as much and will inherit eternal life. 30 But many who are first will be last, and many who are last will be first.
The next passage is about the rich young man. He says that he follows all of the laws of Moses (but who actually does?) so he wants to know that he's done enough good to inherit eternal life. Jesus knows that it's not what we do but the "state" of our hearts that determine that. And the rich man's "state of heart" is on making money and having possessions. (It's not money that is evil, but the love of money. So, Jesus told him to sell everything that he had and give it to the poor. The man didn't continue to discuss it, he just turned away and went away sad. (I think that it was possibly because he realized the "hold" that money had on him but was unwilling to give it up.)
Jesus went on to say the famous verse, "it is easier for a camel to go through the eye of a needle than for someone who is rich to enter the kingdom of God". I won't expound on this--on what the "eye of a needle" actually is. I'll just say that it's either difficult or impossible. But as Jesus pointed out, what's impossible with man, is possible for God. There were a number of people in the early church who were quite wealthy, but they had their priorities straight and used much of it for the ministry. (If anyone is interested in the "eye of the needle" explanation that I hold to, you can ask in the Bible Q & A thread.)
The disciples then asked about themselves seeing as they had left home, family, and livelihoods to follow Jesus. He promised them that when He was on His throne ruling that they would each have their own thrones over the tribes of Israel. He again repeated that the first would be last and the last would be first.