The Fulfillment of the Law
17 “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. 18 For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. 19 Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven. 20 For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.
Jesus addresses the thought that he is not a compliment to what the Jews had been living for thousands of years. He goes farther to explain that not a word would be lost from the Old Testament until everything is accomplished. Staying with that theme, he goes one step further to explain that if you teach something different then what is clearly written you are the least in the kingdom of heaven and those that practice and preach what is written will be the greatest.
Jesus gives a clear picture of what you should do with the message he just gave as well as all you read in the Bible. It is crucial that you know and understand the teachings because like it or not, we are all teacher to someone. Your actions teach those who look up to you and your words teach everyone who hears them. Jesus does not go into lengths to explain that if you know the Word your responsible, its only about what you teach. There is an action plan hidden in this message, learn the Word backwards and forwards and then apply it to every aspect of your life that you may be the greatest in the kingdom.