Galatians 3:15-19

Twentieth_Century(i) 15 To take an illustration, Brothers, from daily life--No one sets aside even an agreement between two men, when once it has been confirmed, nor does he add conditions to it. 16 Now it was to Abraham that the promises were made, 'and to his offspring.' It was not said 'to his offsprings,' as if many persons were meant, but the words were 'to thy offspring,' showing that one person was meant--and that was Christ. 17 My point is this--An agreement already confirmed by God cannot be canceled by the Law, which came four hundred and thirty years later, so as to cause the promise to be set aside. 18 If our heritage is the result of Law, then it has ceased to be the result of a promise. Yet God conferred it on Abraham by a promise. 19 What, then, you ask, was the use of the Law? It was a later addition, to make men conscious of their wrong-doings, and intended to last only till the coming of that 'offspring' to whom the promise had been made; and it was delivered through angels by a mediator.