An Essay on Spirit: Wherein the Doctrine of the Trinity is Considered in the Light of Nature and Reason : as Well as in the Light in which it was Held by the Ancient Hebrews : Compared Also with the Doctrine of the Old and New Testament : with an Inquiry Into the Sentiments of the Primitive Fathers of the Church : and the Doctrine of the Trinity as Maintained by the Egyptians, Pythagoreans and Platonists : Together with Some Remarks on the Athanasian and Nicene Creeds