Verse 19.— These by they who separate themselves. The class mentioned in preceding verse separate them­selves from those who walk as Christ's apostles instruct, because they claimed superior virtue. Claiming superior virtue, they opposed apostolic teaching, saying that the disciples were not walking according to the Spirit. While they thus talked, and thus separated themselves for that pretended reason, they were observing their own selfish and sensual appetites and passions, contrary to the teaching of the Spirit.