John of Damascus

The God proclaimed by the Old Testament and the New is the one who is celebrated and glorified in Trinity, for the Lord said, "I have come not to abolish the law, but to fulfill." For he worked our salvation, for the sake of which all Scripture and every mystery has been revealed. Again, "Search the Scriptures, for it is they that bear witness to me." And the apostle too says, "In many and various ways God spoke of old to our fathers by the prophets, but in these last days he has spoken to us by a Son." Through the Holy Spirit, then, both the law and the prophets, evangelists, apostles, pastors and teachers spoke. Therefore, "all Scripture is inspired by God and profitable," so that to search the sacred Scripture is very good and most profitable for the soul.