Galatians 3:17-21

Mace(i) 17 this therefore I say, that the law, which was not till four hundred and thirty years after, cannot disannul the promise, that was ratified before by God, so as to set the promise afoot. 18 now if the right to the inheritance be from the law, it is no longer founded upon the promise; altho' God made a donation of it to Abraham by promise. 19 "To what purpose then was the law?" it was added as a check to transgressors, till the offspring should come to whom the promise was made; and it was ordained by angels with the intervention of a mediator. 20 now a mediator supposes two parties, of which God is but one. 21 Is the law then opposite to the promises? by no means. for if there had been a law given, which could have given life, certainly justification should have been by the law.