An effectual and easy demonstration, [electronic resource] : from principles purely philosophical, of the truth of the sacred eternal coequal trinity of the godhead; and of the perfect inextension of matter in space. To which is prefixed, As much extracted from a presumed Improvement of Logic, preparing for the Press; as is necessary to render the Whole of what is here delivered, evident to the Apprehension of the lowest intelligent Reader. By John Kirkby, Rector of Blackmanstone in Kent.