Nothing within man, and nothing that man can do, either in nature, or by grace, concurreth to the act of justification before God, as any cause thereof, either efficient, material, formal, or final, but faith alone; all other gifts and graces, as hope, love, the fear of God, are necessary to salvation, as signs thereof, and consequents of faith. Nothing in any man concurres to any cause of this work but faith alone. And faith itself is no principal but only an instrumental cause whereby we receive, apprehend, and apply Christ and his righteousness for our justification.
—William Perkins, A Reformed Catholicke (1616 edition), 572. (HT: Chris Gordon) Emphasis added.