How does a Reformed church grow?
Well, ya see, you have to give it a regular intake of Scripture. At its birth (in the New Testament sense), it was heavily fed on the doctrine of Jesus and the Apostles. Since that time, it's had the Word, and is there by constantly sustained and nourished. For some extra sharpening, thought not essential or necessary to growth, are some sugar goodies like Calvin, Knox,
et al.
Along with this goes the application of said Nourishment.
Flourish, flourish, of church of God!