The grace of God is rejected by modern liberalism. And the result is slavery — the slavery of the law, the wretched bondage by which man undertakes the impossible task of establishing his own righteousness as a ground of acceptance with God. It may seem strange at first sight that “liberalism,” of which the very name means freedom, should in reality by wretched slavery. But the phenomenon is not really so strange. Emancipation from the blessed will of God always involves bondage to some worse taskmaster.
—J. Gresham Machen, Christianity and Liberalism, 1923 (Grand Rapids: Eerdmans, 2009), 121.