When Paul wrote that all scripture is God-breathed, he was only referring to the Old Testament, not the New Testament.

The assertion that Paul was only referring to the Old Testament when he stated that all scripture is God-breathed is a misunderstanding of his intent. Paul was addressing the origin and purpose of Scripture, which encompasses all writings inspired by God, including the New Testament. In 1 Timothy 5:18, Paul quotes both Deuteronomy and Luke, indicating that he considered Luke's Gospel to be on par with the Old Testament Scriptures. This shows that Paul recognized the authority of New Testament writings and included them in the category of Scripture. Furthermore, the fact that Paul was in close association with Luke at the time he wrote to Timothy suggests that the Gospel of Luke was already well-known and accepted as Scripture among early Christians, thus reinforcing the idea that the New Testament writings are divinely inspired.