An essay on inspiration: or An attempt to shew that the pretences of the ancient and the modern Zamzummim, to that ray of divinity, were, and are, deceptions. : Wherein the fundamental principles of Barclay, in his Apology for the Quakers, are refuted ; the necessity of an external revelation proved, and the fiction of an internal one exploded. With a hue and cry after the enthusiast ; his person described ; and his frenzies delineated.