Slothful Pastors

"For though Jacob did not approve of [the idolatry in his household], yet it was not owing to him that the pure worship of God was not gradually subverted. For the corruption which originated with Rachel was now beginning to spread more widely. And the example of all ages teaches the same thing. For scarcely ever does the truth of God so prevail among men, however strenuously pious teachers may labor in maintaining it, but that some superstitions will remain among the common people... Wherefore we must boldly resist those beginnings of evil, lest the true religion should be injured by the sloth and silence of the pastors."

John Calvin, Commentary on Genesis, Genesis 35:2.