Studying Church history is like watching a 15 year old learn to drive. Over time the church heads toward the excesses of one ditch. Then someone comes along and adjusts the course. This trajectory, however, points us toward extremes on the other side. Just before crashing into another heresy, God uses another reformer to correct the direction and prevents a collision.
Somehow, weaving through history, Christ has kept His Church between the ditches of error on the road of truth. I’m glad it’s His Church and the gates of Hell will not prevail!