After Christ, the object of faith, has come into the world, all men are directed to focus on him alone. Israel, who had been allowed to worship according to the types and shadows of the law, was now commanded to leave behind those elementary principles and to embrace the far more excellent glory of Christ to which those types had all along pointed.
The lessons which the schoolmaster taught us during our youth are not to be completely thrown away and forgotten the moment we reached adult life. Those lessons were a preparation for adult life; the things we learnt then we now use. We put them into practice, we draw on that knowledge, and we exercise the same discipline over ourselves which previously our master exercised over us. But we do it voluntarily now and not under compulsion. This is a true analogy with the Christian life where the Christian serves Christ and obeys him out of love.