Whosoever, not transgresseth, but 'has erroneous ideas.' No claim of superior knowledge can be allowed which sets aside what Christ taught. Doctrine in the NT. is never synonymous with' dogma,' but means' teaching.'
Related Commentaries of 2 John 1:9
2 John 1:9
9 Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.