What does it mean to abide in Christ's doctrine?

Abiding in Christ's doctrine involves a continual commitment to the teachings of Jesus, as articulated in His Word. John warns in 2 John that those who transgress and do not abide in the doctrine of Christ have not God, highlighting the crucial link between obedience to biblical truth and our relationship with the Father and the Son. This abiding is not merely intellectual agreement but must penetrate the heart, leading to regeneration by the Spirit. Thus, abiding in Christ's doctrine is essential for spiritual vitality and assurance of eternal life.