It is impossible to comprehend the heights of the moral meaning that the New Testament contains if you consider it in isolation from the Old Testament. Only by reading it, page by page, we can understand what a long and difficult path people went from the commandments of Moses to the commandments of Jesus, voiced in the Sermon on the Mount.
There is no need to consider these two parts of the Bible from the point of view of their content, since it describes events that happened to different people at different times. And John Chrysostom was right , seeing their difference not in essence, but in time. A close connection in the other is in a community of religious-legislative and moral-doctrinal aspects. Christ recognized this connection when he said that he came to fulfill the law and prophecies, and not to break them. The Christian Church considers the New Testament to be higher morally, but recognizes that it not only does not abolish Old Testament moral standards, but deepens and strengthens them.
In preaching, Christ drew attention to the main principle that determines the relationship of man to man. The essence of this main principle, which harmonizes the new doctrine with the old law and the teachings of the prophets, Jesus expressed in this way: in everything that we want people to do with us, so should we.
The motive for punishing an unrighteous life also unites the Old and New Testaments. Both of them promise people an inevitable, but fair judgment in accordance with the measure of love and mercy that we showed or did not show to each other. These criteria are also fundamental to the old law and the prophets. Love for people, love for God - Christ pointed to these commandments of the New Testament as the greatest, most important. On identical commandments, the law and the prophets are also affirmed.
However, the Jewish Bible according to the canon of Israel includes four sections, consisting of twenty-two books, but does not have a New Testament in itself. But it contains a lot of evidence of holiness and "divine inspiration" of the Old Testament texts. All four authors of the Gospels speak of this. This is in the acts of the apostles, in the epistles to the nations, in the apostolic conciliar epistles.
Carefully reading the Gospel texts, it is easy to see that one of the recurring arguments is the statement “Thus says the Scripture.” By Scripture, the authors meant the Old Testament. If we continue the parallel and compare both canons, one more similarity emerges: the New Testament also consists of canonical books (there are 27), which are four sections.
Given all these important points, both Christian theologians and objective representatives of secular science express a common position: Covenants are not opposite, they are different. The Jews, as you know, do not recognize Jesus as the Messiah. And the New Testament is the story of his earthly life. It is logical that the Jews do not recognize the Testament itself. Why? It has been suggested that the reason is that the teachings of Christ are addressed to all nations, and not to Jews alone. And this excludes the God-chosen one individual people. Perhaps the statement is controversial, but there is still some truth in it.