A Treatise on the Religious Affections – Preface and Section 1

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 plainly by this means, principally, that he has prevailed against all revivals of religion, since the first founding of the christian church.

Treatise on the Religious Affections – Preface – Sect 1