Such men seem to forget the great lesson that the differential calculus has taught us. It represents one of the greatest developments of modern mathematics. It does not solve problems by absolute solutions but by such approximations as make the answer which cannot be reached very clear. It has been of immense value in adding to the knowledge of mankind and in giving science particularly a command over principles that would otherwise seem impossible. Religion requires {32} faith to complete it. Knowledge can never more than approximate conclusions with regard to many religious questions. Such approximations, however, like the answers in differential calculus, represent real advances on the road to knowledge that are of great value in directing men toward what is best in life. Mr. Frederic Harrison has answered this question "Can We Still Believe?" by insisting that belief in the hereafter is the most precious heritage that man has, to be fostered above all else. He said: "The great truth of a life beyond the grave is indeed one of the best possessions of Man, the fondest of all noble, living and working doctrines on earth. When Paul first preached it in that sublime song of triumph over death, which has so often thrilled us to the marrow as we stood round the coffined dead, he gave the human race a new and imperishable hope to last while the planet endures.... Let us cherish and hold fast this glad tiding of good things." Any one who faces the question of religion seriously realizes that not only it is not a thing of the past but that the rationalistic tendencies of the later nineteenth century have had their usual inevitable reaction emphasized by the Great War, so that men are readier to be swayed by religious influences than ever before. The more one studies the problems of health of mind and of body connected with religion, and the strong factor that it is for the making of character, the shaping of destiny and the cultivation of happiness, the more one realizes the truth of Napoleon's expression that if religion were to disappear we should have to reinvent it, because of the immense benefit that it represents for mankind. {33} CHAPTER II PRAYER