**The Use of the Reason.** Whether knowledge be obtained by any or all of the methods indicated, it should be carefully examined in the light of reason. The only knowledge that will help in the establishment of a satisfactory religion is true knowledge. Truth is the end of the search. False or apparently true knowledge often intrudes itself upon the attention and at times it is so well disguised as to be dangerously deceptive. Man must learn of the universe, precisely as it is, or he can not successfully find his place in it. A man should therefore use his reasoning faculty in all matters involving truth, and especially as concerning his religion. **The Foundation of Rational Theology.** The Gospel, or rational theology, is founded on truth, on all truth, for "truth is knowledge of things as they are, and as they were, and as they are to come," and "truth has no end." In building a philosophy of life a man, therefore, can not say that some truth must be considered and other truth rejected. Only on the basis of all truth, that is, all true knowledge, can his religion be built. Further, the perfection of his knowledge, that is, the extent of his truth possessions, will determine the value of his religion to him. Therefore, "it is impossible for a man to be saved in ignorance," "a man is saved no faster than he obtains knowledge," and "the glory of God is intelligence." CHAPTER 3. ETERNALISM. The conceptions necessary for logical thought belong to the Gospel as well as to science, for a satisfactory life philosophy must be based on all knowledge known to man. **All Knowledge, the Basis.** The Gospel, as the largest knowledge, must include the knowledge of all sciences. The conceptions of time and space are quite as necessary in theology as in natural science or in any other branch of human thought. The Gospel does not claim, however, possession of ultimate knowledge concerning space or time or other fundamental conceptions. Indeed, man is, ordinarily, allowed to work out for himself the truths of the universe and to organize them into systems of thought which he may follow profitably. Knowledge is given directly by a superior intelligence only when it becomes indispensable. Moreover, there are innumerable phenomena in the universe which can not be explained by the human understanding as at present developed. The distinguishing feature of the Gospel is that it possesses the key to the final philosophy of life. In outline it offers the entire plan of life in the universe; and man may engage for all time to come in the elaboration and development of each department of this great universal plan of human life, without requiring an expansion of the outline. The plan is complete.