It is easier to think about the gospel and everything about it in terms of progress. It is more challenging, and thus more transformative, to think of it in terms of fulfillment.
“And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth.” (John 1.14)
“Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill. “For truly I say to you, until heaven and earth pass away, not the smallest letter or stroke shall pass from the Law until all is accomplished. “Whoever then annuls one of the least of these commandments, and teaches others to do the same, shall be called least in the kingdom of heaven; but whoever keeps and teaches them, he shall be called great in the kingdom of heaven. “For I say to you that unless your righteousness surpasses that of the scribes and Pharisees, you will not enter the kingdom of heaven. (Matthew 5.17-20)
“The Law does not exist, rules and God’s commandments do not exist for man to serve them. But the law and rules exist so that they might serve man, us. And so the Lord didn’t come to destroy the law and rules, but to fulfill them, that is, to give them meaning and fulfillment. For if rules and the law are the goal in and of themselves, then man becomes a frustrated and unhappy person, whose freedom and right to choose is restricted. The law exists as an aid so that love would develop within us, that virtues develop, that we might do that which is good and in line with God’s will. The Lord shows us that love is above everything else. When love is in question and the need for us to do good to our neighbor, to sacrifice ourselves for the sake of Christ, then laws and rules do not exist which could or should constrain us. After all, the Lord Himself comes to this world against all the laws of nature in order to change the same. He went to the Cross and His suffering completely innocent. He didn’t ask for justice to come to His aid, He didn’t call the Law to His aid, but He went above and beyond that in order to witness and confirm love, to His very crucifixion.” – excerpted from a homily on December 14, 2014 of Metropolitan Porfirije.