The Co-ordination of grace and duty

From an article by Hugh Martin by this name. He writes:

And it is a melancholy, yet instructive, view of human nature, in its unrenewed condition, to behold the mind of man thus not only misunderstanding the great scheme of God’s sovereign grace in Christ Jesus, but, as it were, ingeniously and perseveringly contradicting and reversing it throughout,—insisting on works where God has excluded them, restraining them where God has called for them. But be not deceived. If you are to work for justification, God can never justify you. If you are not to work unto sanctification, God can never sanctify you.