Seeking a pure life without a pure nature is building without a foundation. And there is no seeking a new nature from the law, for it bids us make brick without straw, and says to the cripple, ‘Walk,’ without giving any strength.
-Walter Marshall, The Gospel Mystery of Sanctification, Chapter 14
I’ve written about this same theme in detail ELSEWHERE. For the sake of those who won’t click the link, let me share a similar statement by John Owen on the subject of sanctification:
This is the work of the Spirit; by him alone is it to be wrought, and by no other power is it to be brought about. Mortification from a self-strength, carried on by ways of self-invention, unto the end of a self-righteousness, is the soul and substance of all false religion in the world (Mortification of Sin in Believers, ch. 1).