Brethren, I speak of things common among men: No one sets a covenant aside, or enjoins any thing additional after it is confirmed, though it be a man's covenant.

But we see that the child of the slave-girl was born in the common course of nature; but the child of the free woman in fulfilment of the promise.

Yet just as, at that time, the child born in the common course of nature persecuted the one whose birth was due to the power of the Spirit, so it is now.