Fulfillment of the Law

Matthew 5:17-20
Jesus come to fulfill the Law: 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.
Unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.
The righteousness here is the behavior, and the kingdom of heaven is our reward.
Why?
In may have seemed to some, from Jesus' attitude to the Sabbath and other laws, that he wanted to remove the law completely.
Far from it. Rather, he will fulfill the law God gave through Moses. It is all too easy to take the law in a superficial, legalistic(墨守成规) way, to be content with keeping the letter. It is the spirit, the principle behind the law, that reveals God's will.
How?
Obey the law but more important is the spirit, the principle behind the law that reveals God's will.