This is a quote from Life Together by Dietrich Bonhoeffer from the section on Community:
Christian community is like the Christian’s sanctification. It is a gift of God which we cannot claim. Only God knows the real state of our fellowship, of our sanctification. What may appear weak and trifling to us may be great and glorious to God. Just as the Christian should not be constantly feeling his spiritual pulse, so, too, the Christian community has not been given to us by God for us to be constantly taking its temperature. The more thankfully we daily receive what is given to us, the more surely and steadily will fellowship increase and grow from day to day as God pleases.
Christian brotherhood is not an ideal which we must realize; it is rather a reality created by God in Christ in which we may participate. The more clearly we learn to recognize that the ground and strength and promise of all our fellowship is in Jesus Christ alone, the more serenely shall we think of our fellowship and pray and hope for it.
Life Together. Copyright 1954 by HarperCollins Publishers.