[To the question] "Where can I find the true Church?" [the English reformers] gave a more mundane answer. Assurance with regard to the Church was to be found neither in the biblical idealism of the Puritans nor in the conservative traditionalism of the Catholics. The gospel did not come with fail-safe guarantees. The Church always exists under grace, and while truth and purity were not to be taken lightly, their full achievement was still awaited and in the meantime could only be perceived in faith. No form of discipline or safeguards on doctrine could replace that perception.
-from "The Doctrine of the Church" by Philip H.E. Thomas in The Study of Anglicanism