44 “The kingdom of heaven is like a treasure hidden in the field, which a man found and hid again; and from joy over it he goes and sells all that he has and buys that field. 45 “Again, the kingdom of heaven is like a merchant seeking fine pearls, 46 and upon finding one pearl of great value, he went and sold all that he had and bought it. Matt 13:44–46, NASB
The correct way to understand Sacred Scripture is that the Old Testament contains the “old” promises of the Messiah and the fulfillment of His Kingdom while the New Testament is the “new” revelation from Jesus and His Apostles, which reveal to us how the “old” promises are fulfilled in Him. The New Testament explains the Old Testament, not the other way around.