The defense of doctrine is a crucial aspect of the Christian faith, as it involves the protection and preservation of the fundamental teachings of the Bible. According to Jude 1:3, believers are exhorted to "contend for the faith that was once for all delivered to the saints," emphasizing the importance of defending the gospel against false teachings and ideologies. In 1 Timothy 4:16, the apostle Paul instructs Timothy to "watch your life and doctrine closely," highlighting the need for Christians to be vigilant in upholding sound doctrine, as also emphasized in 2 Timothy 4:2, where Paul charges Timothy to "preach the word" and correct those who oppose the truth. By defending doctrine, Christians demonstrate their commitment to the authority and integrity of Scripture, ensuring the continuation of the faith in its pure and unadulterated form.
John Gill discusses the doctrine of the eternal Sonship of Christ, asserting that Jesus is the Son of God by eternal generation, existing as such before His incarnation. He highlights the historical opposition to this doctrine from various heretics throughout Christian history, including Simon Magus