This is my devotion from Matthew 5, v.17-20.
Jesus came not to destroy the law but to fulfill it, as said in verse 17. It means that was the reason for his first coming, and it should have been accomplished by that coming. In verse 18, he said that nothing shall be removed or edited from law UNTIL the law is fulfilled. "Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven." (v. 19)
But the next verse (v. 20) is important. "For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven." If you have THE SAME or LESS righteousness of the scribes and the Pharisees, you WILL NOT enter the Kingdom of God! You SHALL IN NO CASE enter the kingdom of heaven.
As of the moment, the entire truth of v. 19 is unknown to me. What I understand about it is that we should not live as hypocrites. We should walk the talk. I do not understand why both of the examples are still called least or great in the kingdom of heaven.
But I think what Jesus is saying is this: I am the true and only feasible righteousness in the eyes of God. The righteousness of the scribes and the Pharisees depend on their compliance to the law of God. And we know that no one could ever fully accomplish all that is written in the law. The Pharisees in Jesus' time are even worse, for they are hypocrites. Still, hypocrite or not, their righteousness will not grant them entry into the kigdom of God.
We need a greater righteousness. That righteousness is the one from Jesus Christ. He is the only one who has truly fulfilled the law. That is actually the reason why he came. And that righteousness is His gifts for us; we only need to receive it. That righteousness supersedes man's best attempt at righteousness. That is the righteousness that can grant us entry into the kingdom of heaven.
Jesus Christ then went on to discuss the futility of man to attempt to be truly righteous on his own. Verses 19 and the following offer brutal options in order for man to have more chances of pursuing righteousness. Righteousness is extremely hard. In fact Jesus said that it is "humanly impossible" (on the incident with the rich man)
And the chapter ended with him saying "Be ye therefore perfect, even as your Father which is in heaven is perfect."