Charles Spurgeon Commentary Galatians 3:1-5

"O foolish Galatians, who did bewitch you, before whose eyes Jesus Christ was openly set forth crucified? This only would I learn from you. Received ye the Spirit by the works of the law, or by the hearing of faith? Are ye so foolish? having begun in the Spirit, are ye now perfected in the flesh? Did ye suffer so many things in vain? if it be indeed in vain. He therefore that supplieth to you the Spirit, and worketh miracles among you, [doeth he it] by the works of the law, or by the hearing of faith?" — Galatians 3:1-5 (ASV)

Now I say, That the heir, as long as he is a child, differeth nothing from a servant, though he be lord of all; but is under tutors and governors until the time appointed of the father. Even so we, when we were children, were in bondage under the elements of the world: but when the fullness of the time was come, God sent forth his Son, made of a woman, made under the law, to redeem them that were under the law, that we might receive the adoption of sons.

Like little children, the Jewish believers were under the law.

They observed this ceremony and that, just as children, even though they may be heirs to vast estates, yet, while they are in their minority, are under tutors and governors. But now in Christ we have come of age, and we have done with those school-books and that tutorship, and we have received the adoption of sons. Now, we have joy and peace in believing; we have begun to enter into our possession; we have the earnest of it already, and eventually we shall receive the fullness of the inheritance of the saints in light.