Paul and Covenantal Nomism

Michael S. Horton writes an insightful piece on the heresy of covenantal nomism, which tries to avoid the charge of legalism by teaching that one enters the covenant by grace alone. Of course, that is not where the problem lies, but rather in the second part of the proposition: that one remains in the covenant by obedience - or, in the words of R.J. Rushdoony, "Justification is by grace; sanctification is by law." That is precisely what the medieval Church taught and was the very point on which the Reformers opposed them.