A buddy of mine told me to read "Self-Improvement a Snare" by J. B. Stoney (New Ministry, Vol. 8, pp. 397–402). I did, and I'm passing it on.
Thus the question is, not as to whether you are improved or not, but whether you are in Adam or in Christ; if in Christ you can say, I have "crucified the flesh with the affections and lusts", (Galatians 5:24) and you not only know that He lives in you, and that thus you are governed by a new Person, but as you behold His glory - the very beginning of the gospel - you are transformed into His image, and you are the expression of Him here, whether in your individual circumstances, or in the circle of His interests. (p. 401)