Galatians 3:24

So that the law is become our tutor to bring us unto Christ, that we might be justified by faith. [In the first of these two verses, Paul enlarges the thought of verse 22, fully describing those subjects of the law as prisoners incarcerated in a fortress, and awaiting the coming of a deliverer. The next image is distinct from that of a fortress, yet very similar to it; for the pedagogue or tutor was usually a slave, whose duty it was to take charge of a boy from his childhood to his majority, shield him from physical and moral evil, accompany him in all his amusement, and, as it were, keep him as a prisoner at large, lest he should in any way injure himself. Now, the law was such a tutor to bring those under his care to a state of development fit for the society and fellowship of Christ, the spiritual father.]