On The Two Testaments
Origen, one of the early church fathers, wrote this in his Homily on Numbers:
I do not call the Law an “Old Testament” if I understand it in the Spirit. The Law becomes an “Old Testament” only for those who wish to understand it carnally, but for those who understand it and apply it in the Spirit and in the Gospel sense, the Law is ever new and the two Testaments are a new Testament for us, not because of their date in time but because of the newness of their meaning. For those who do not respect the covenant of love, even the Gospels are “old”.