The Church Before Luther
The church of God, take it in general for good and bad in it, and for the means of salvation that they had in some measure, it may be called a kind of visible church, though very corruptly; and so considered, our church, those that possessed our religion, was the best of that church in the declining times of it. As in a lump of gold that is not yet refined to bullion there is gold, and a great deal of earth: take it in the whole, we say it is gold; but when it is refined to bullion, we say it is gold severed. Now our church in the midst of popery was as gold in the midst of earth unrefined; that is, there were many Romish Churches, and ours was in the midst of them, the temple in the midst of the court; that is, the true church in the visible church. There were a great company that held the tenets of the gospel, especially at the hours of death, that denied popery. But then there were some that were refined as bullion after, as the Waldenses,‡ that were a severed company of people, besides other holy men and women that grew up by hearing somewhat of Christ in their sermons, and somewhat in the sacrament. They left out that that was bad, and took that that was good. Besides the lump of gold, there was some refined gold, when popery was in its perfection; and those they termed Waldenses, and the like. There was alway a company that held the truth against them. I am sorry to mention these things, in a point tending more to edification. Our churches therefore are refined churches, that is, gold singled out of the dross of popery. They are a corrupt, and our church a refined, a visible congregation.
Richard Sibbes, A Breathing After God, The Complete Works of Richard Sibbes, ed. Alexander Balloch Grosart, vol. 2 (Edinburgh; London; Dublin: James Nichol; James Nisbet And Co.; W. Robertson, 1862), 241-242.