Galatians 4:1

Now I say, that the heir, as long as he is a child, is in a state of servitude, tho' he is to be lord of all;

Galatians 4:23

he, who was of the bond-woman, was born according to the ordinary course of nature; but he, who was of the free-woman, was born by virtue of the promise.

Galatians 4:29

but as then, he that was born in the ordinary course of nature, persecuted him, who was born by an extraordinary power; even so it is now.

Treasury of Scripture Knowledge

Summary

Now I say, That the heir, as long as he is a child, differeth nothing from a servant, though he be lord of all;

Bible References

That

Galatians 4:23
he, who was of the bond-woman, was born according to the ordinary course of nature; but he, who was of the free-woman, was born by virtue of the promise.