“Nothing that is imperfect can make us perfect in the sight of God. Hence the admirable direction of an old divine: ‘Labor after sanctification to the utmost; but do not make a Christ of it; if so, it must come down, one way or another. Christ’s obedience and sufferings, not thy sanctification, must be thy justification.’ “
ResponsiveReiding 
That is a great quote from a wonderful sermon: Robert Murray M’Cheyne, Additional Remains of the Rev. Robert Murray M’Cheyne, Late Minister of St. Peter’s Church, Dundee: Consisting of Various Sermons and Lectures Delivered by Him in the Course of His Ministry (London: John Johnstone, 1847), pg. 15, s.v. Sermon II: “A Son Honoureth His Father” (Mal. 1:6), preached 22 NOV 1835 at Larbert, Scotland while serving as an assistant to John Bonar; on Google Books at https://books.google.com/books?id=6CIRAAAAIAAJ&printsec=frontcover#v=onepage&q&f=false [accessed 29 MAY 2018]; also in Robert Murray M’Cheyne, The Works of the Late Rev. Robert Murray McCheyne, 2 vols. (New York: Robert Carter, 1847), II:170, s.v. Sermon XXVIII. on Google Books at https://books.google.com/books?id=DFgXAAAAYAAJ&printsec=frontcover#v=onepage&q&f=false [accessed 29 MAY 2018].
It’s embarassing how I’m drawn toward what is advised against, and I don’t even labor that hard at it.