A vineyard signifies the church where the Word is, by which the Lord is known. (Apocalypse Revealed 650)

If we turn ourselves toward the Lord, we can get the full inflowing of His wisdom and love; if we turn away from Him we cast ourselves into cold and shadow -- we turn ourselves toward hell. In the Bible, "turning" generally refers to a change in spiritual state, as people turn themselves toward the Lord or away from the Lord.