We must say bluntly that when the church ceases to be a mission, then she ceases to have any right to the titles by which she is adorned in the New Testament.
Lesslie Newbigin, quoted by Richard G Jones, Anthony J Wesson Towards a Radical Church
St. Augustine, somewhere, has a phrase about the Church of his day, as, like a frost-bound tree, seeming dead, but waiting for the summer. Sacred Trinity had every sign of being dead but waiting for nothing.
The Protestant idea of a church, expressed in the Augsburg Confession, and in very similar terms in the Thirty Nine Articles (nineteenth article) is that the visible church is a congregation of faithful or believing men, “In which the pure Word of God is preached and the sacraments administered according to Christ’s ordinance in all those things that of necessity are requisite to the same. “
Wherever we see the word of God sincerely preached and heard, wherever we see the sacraments administered according to the institution of Christ, there we cannot have any doubt that the Church of God has some existence, since his promise cannot fail, ‘Where two or three are gathered together in my name, there am I in the midst.’
Calvin: Institution IV 1.9 quoted by Lesslie Newbigin: The Household of God
Wherever you see this word preached, believed, confessed and acted on, do not doubt that there must be a true ecclesia sancta catholica...for God’s word does not go away empty.
Martin Luther quoted by Lesslie Newbigin: The Household of God