“All Scripture is divided into two Testaments. What preceded the advent and passion of Christ–that is, the law and the prophets–is called the Old [Testament]; but what was written after his resurrection is named the New Testament. The Jews made use of the Old, we of the New. Yet, they are not dissonant. The New Testament is the fulfilling of the Old, and in both there is the same testator, even Christ who suffered death for us and made us heirs of his everlasting kingdom…
When, therefore, we who were in time past as it were blind, and as it were shut up in the prison of folly, were sitting in darkness ignorant of God and of the truth, we have been enlightened by him, who adopted us by his testament; and having freed us from cruel chains, and brought us out to the light of wisdom, he admitted us to the inheritance of his heavenly kingdom.”
Lactantius (c. 260-c. 330) Christian apologist in Divine Institutes 4.20. ANF 7:122-23. ACCS.H 129.