A battle has been raging for some years now regarding how believers progress in sanctification. It has probably been raging in one form or another for centuries. For those who have not been following it, a few words on why the question is important.
First, by definition, genuine believers want their character and conduct to please the One they call Lord. Second, they also discover quickly by experience (if not by reading the NT) that they do not immediately please Him completely and consistently. Third, they want to know what they should do to improve. In short, “What must I do to be sanctified?” is a question every true disciple is interested in answering correctly.
One school of thought that has made major inroads in the last few years generally reacts negatively to calls to Christian duty and obedience—especially when those calls focus on our nonconformity to the world we live in. Warnings against “legalism” and appeals to “get the gospel right” or to be truly “gospel centered” are typical. To the extent that this perspective offers a clear view of sanctification at all, it often boils down to “just preach the gospel to yourself; that’s all you need to do; God will do the rest.”