The Apostle Paul
Galatians 4:1ESV·traditional attribution

I mean that the heir, as long as he is a child, is no different from a slave, though he is the owner of everything,

John Calvin Reformed @genevareformer

1. Now I say. Whoever made the division into chapters has improperly separated this paragraph from the preceding, as it is nothing else than the concluding section, (ἐπεξεργασία,) in which Paul explains and illustrates the difference that exists between us and the ancient people. He does so by introducing a third comparison, drawn from the relation which a person under age bears to his tutor.

Matthew Henry Presbyterian @wholebiblehenry

In this chapter the apostle deals plainly with those who hearkened to the judaizing teachers, who cried up the law of Moses in competition with the gospel of Christ, and endeavored to bring them under the bondage of it. To convince them of their folly, and to rectify their mistake herein, in these verses he prosecutes the comparison of a child under age, which he...

Commenting on Galatians 4:1-7

John Gill Reformed Baptist @doctorgill

Now I say,.... To illustrate what he had said of the law's being a schoolmaster to the Jews until the coming of Christ, and then ceasing as such, he proposes the case of an heir during his minority, till he come to the proper time of enjoying his estate.