^{15 Ref} Brothers, as men would say, even a man's agreement, when it has been made certain, may not be put on one side, or have additions made to it.

^{16 Ref} Now to Abraham were the undertakings given, and to his seed. He says not, And to seeds, as of a great number; but as of one, he says, And to your seed, which is Christ.

^{17 Ref} Now this I say: The law, which came four hundred and thirty years after, does not put an end to the agreement made before by God, so as to make the undertaking without effect.

^{18 Ref} Because if the heritage is by the law, it is no longer dependent on the word of God; but God gave it to Abraham by his word.

^{19 Ref} What then is the law? It was an addition made because of sin, till the coming of the seed to whom the undertaking had been given; and it was ordered through angels by the hand of a go-between.

^{20 Ref} Now a go-between is not a go-between of one; but God is one.

^{21 Ref} Is the law then against the words of God? in no way; because if there had been a law which was able to give life, truly righteousness would have been by the law.