Since the days of the apostles, the church of Jesus Christ has had to contend with false teachers, and with the great damage that they bring. Anyone with even a superficial knowledge of church history knows that, very often, it is false teaching that appears to win the day. True religion is very often overthrown by those who pervert the Gospel of the Lord Jesus Christ. The apostle Paul knew only too well the cost of maintaining the struggle against heresy and error. He was followed by generations of church leaders, some of whom are very well-known even in our day, who had to stand fast in the face of enormous opposition, for the claims of truth.