Just read this today. Not specifically about 'one church' but so deeply profound and challenging that it deserves mention:

"What a lot of trouble and waste of time would be saved if we really were led by the Spirit in what we do." T.Austin Sparks.

That's all.

Thinking God's thoughts

"In thinking God's thoughts about the church we may have to rid our minds of some popular misconceptions. To many the church is simply the sum total of the various denominations, each with its own particular organisation. But the New Testament has nothing to say about denominations. All that we find there is 'the church' ! All true believers regardless of colour, race or tradition, comprise 'the church'.

It is very important as we pick our way through the confused situation we call 'Christendom', to keep God's blueprint always before us."
Arthur Wallis, Into Battle