All the Scriptures - the Law, the Prophets, and the Psalms - are fulfilled in Christ. The Gospel is this "Good News." Its first proclamation is summarized by St. Matthew in the Sermon on the Mount; The prayer to our Father is at the center of this proclamation. It is in this context that each petition bequeathed to us by the Lord is illuminated:
The Lord's Prayer is the most perfect of prayers.... In it we ask, not only for all the things we can rightly desire, but also in the sequence that they should be desired. This prayer not only teaches us to ask for things, but also in what order we should desire them.
Source: Catechism of the Catholic Church (Vatican.va)