Tough 4

To the Reformers' doctrine of justification by faith alone Reformed theology has held down the centuries, maintaining it to be both scriptural in substance and life-giving in effect. This tenacity has, however, involved constant conflict, as it still does. Two things have long threatened the truth as stated: first, the intruding of works as the ground of justification; second, the displacing of the cross as the ground of justification. Both are familiar weeds in the church's garden; both express in very obvious ways the craving for self-justification which lurks (often in disguise!) in the fallen human heart. Something may be said about each. - Dr. J. I. Packer

http://www.the-highway.com/Justification_Packer.html