IRENAEUS having enquired why the Law was ever given, seeing that Paul declares it to be injurious: S. Ambrose replies that it would have been useless, had we kept that natural law which is written on our hearts, and is found even in infants; but that, this being broken, the former became necessary, that it might take away all excuse by its manifestation of that sin which was afterwards removed by the grace of Christ.
Beginning of the Letter -
Greatly, it would seem, have you been moved by the lesson from the Apostle, having heard read to-day, Because the Law worketh wrath; for where no law is, there is no transgression. And therefore you have thought fit to ask why the Law was promulgated, if it profited nothing, nay rather, by working wrath and bringing in transgression, was injurious....
Now the world becomes guilty before God by the Law, in that all are made amenable to its prescripts, but no man is justified by its works. And since by the Law comes the knowledge of sin, but not the remission of guilt, the Law, which has made all sinners, would seem to have been injurious.....
But when the Lord Jesus came, He forgave all men that sin which none could escape, and blotted out the handwriting against us by the shedding of His own Blood. This then is the Apostle's meaning; sin abounded by the Law, but grace abounded by Jesus; for after that the whole world became guilty, He took away the sin of the whole world, as John bore witness, saying: Behold the Lamb of God, which taketh away the sin of the world. Wherefore let no man glory in works, for by his works no man shall be justified, for he that is just hath a free gift, for he is justified by the Bath. It is faith then which delivers by the blood of Christ, for Blessed is the man to whom sin is remitted, and, pardon granted.
Farewell, my son; love me, for I also love you
Letter 73 by saint Ambrose
