Mixture of Counterfeit with Truth

"It is by the mixture of counterfeit religion with true, not discerned and distinguished, that the devil has had his greatest advantage against the cause and kingdom of Christ. It is by this means, principally, that he has prevailed against all revivings of religion, since the first founding of the Christian church.

... it greatly concerns us to use our utmost endeavors, clearly to discern, and have it well settled and established, wherein true religion does consist. Till this be done, it may be expected that great revivals of religion will be but of short continuance; till this be done, there is but little good to be expected of all our warm debates, in conversation and from the press, not knowing clearly and distinctly what we ought to contend for."

--Jonathan Edwards, from the Preface to A TREATISE CONCERNING RELIGIOUS AFFECTIONS