"And Isaac dug again the wells of water which they had dug in the days of Abraham his father, for the Philistines had stopped them up after the death of Abraham. He called them by the names which his father had called them."
The faithful church is to be constantly "re-digging" the old gospel wells, left to us by our spiritual forbearers. The "Philistines," (or, the people of the world), are always seeking to "stop them up" with the gospel and things of the "earth."
Our task is not to create anything new; but to re-claim what is already ours in Christ. Once we do this, we are to "call them by the names" which our fathers called them.
[Puritan quote of the day: "He that loves God is full of fear lest it should go ill with the church." --Thomas Watson, in "All Things for Good"]