Why is it necessary to avoid false teachers?

The necessity of avoiding false teachers lies in the serious danger they pose to the church's doctrinal integrity. In 2 John 9-10, believers are warned not to receive or greet anyone who does not abide by the doctrine of Christ. This is a directive aimed at preserving the purity of the faith, as false teachings can lead many astray and cause divisions within the congregation. The call to avoid such individuals is rooted in love for God and a commitment to uphold the truth of the Gospel, which is paramount for the spiritual vitality of the church.