On the evening of December 19, 1900, Mr. Fiske delivered in Sanders Theatre, Cambridge, the address here printed. It was given at the request of Harvard University, in accordance with the terms of the Ingersoll lectureship, but it stood clearly in Mr. Fiske's mind as a continuation, and in a sense the completion, of that series of philosophic studies successively issued under the titles, "The Destiny of Man viewed in the Light of his Origin," "The Idea of God as affected by Modern Knowledge," and "Through Nature to God."