Jonathan Edwards began his 'Discourse on the Trinity' in 1730. Edwards's Discourse on the Trinity contains other important and interesting elements, such as his notion of the divine attributes and relations. This chapter examines the foundational principles Edwards employed in conceiving his understanding and the working out of these principles in his exposition. It discusses Edwards's defense of the Trinity by comparing and contrasting his thought with that of Thomas Aquinas. Edwards continues his fuller analysis of Gods idea of himself by arguing that such an idea is something distinct within the essence of God. If within the one essence of God there is God and Gods idea of him, then one can confidently posit a duality within that one essence. The Holy Spirit is this act of supreme love, which is the source and expression of the Fathers and the Sons mutual delight and happiness. This understanding is fully in keeping with the Western Thomistic tradition.