" Sibbes seems to suggest that, even in reforming the Reformation, the real spirit of reformation could be lost, and all the doubts and anxieties of medieval Catholicism come streaming back in through the back door of a zealous Christian moralism that had lost sight of the grace of God. It was to maintain this essence of the Reformation that Sibbes and Puritans like him sought to teach and proclaim ‘the gracious nature and office of Christ; the right conceit of which is the spring of all service to Christ, and comfort from him’. "

― Michael Reeves , The Unquenchable Flame: Discovering the Heart of the Reformation