Galatians 3:26

For ye are all the children of God. Both Jews, who were under the law, and Gentiles, who were not, are become, by faith in Christ, children of God. The conjunction for is causal, and indicates the reason why we are not under the law as a pædagogue, viz., because we are the sons of God. Children are like slaves, S. Paul says, in chap. iv. 1, nay, like the lower animals, in needing a pædagogue to enable them to resist the motions of sense. But those who by faith in Christ have left this state of childhood, and are become sons of God, have grown to man's estate. It would be, therefore, absurd for them to be made subject to the law as their pædagogue, as though they were still children. This would be as absurd, says Theophylact, as for a man, when the day had dawned, to prefer a lamp to the sun. This is a rebuke to the Judaisers, which may be summarised thus: Christ is to us as a father to his grown-up sons. Why do you then go back to the pædagogy of the law? Why hold out your hand again like boys to the ferule?

By faith. Not faith alone, but by faith manifested in baptism and other acts.