It has been frequently observed, that very few were clear in their judgment both with regard to justification and sanctification. Many who have spoken and written admirably well concerning justification, had no clear conception, nay, were totally ignorant, of the doctrine of sanctification. Who has wrote more ably than Martin Luther on justification by faith alone? And who was more ignorant of the doctrine of sanctification, or more confused in his conceptions of it? In order to be thoroughly convinced of this, of his total ignorance with regard to sanctification, there needs no more than to read over, without prejudice, his celebrated comment on the Epistle to the Galatians. On the other hand, how many writers of the Romish Church (as Francis Sales and Juan de Castaniza, in particular) have wrote strongly and scripturally on sanctification, who, nevertheless, were entirely unacquainted with the nature of justification! ... But it has pleased God to give the Methodists a full and clear knowledge of each, and the wide difference between them.
-John Wesley Sermon 107, "On God's Vineyard"
Read the complete post at http://theivybush.blogspot.com/2007/06/more-wesley-quotes.html