The gospel doesn’t expose sin except through the law, which is spiritual and which defines sin as opposition to God’s will. Away with him who claims that transgressors don’t sin against the law but only dishonor the Son of God!
Such speculative theologians are the bane of the churches. Without a conscience, without knowledge, and without logical discrimination they teach everything confusedly and say things like this, ‘Love is the fulfilment of the law, and therefore we have no need of the law.’
But those wretched fellows neglect the minor premise: that this fulfilment (namely, love) is weak in our flesh, that we must struggle daily against the flesh with the help of the Spirit, and this belongs under the law.” — Martin Luther