Revelation can be supplemented by reason. Christ Himself gave reasons for His belief, and put in modern form, these reasons are, to my mind, conclusive. You remember the passage in the earliest Gospel: "But as touching the dead, that they are raised; have ye not read in the book of Moses, in the place concerning the bush, how God spake unto him, saying, I am the God of Abraham, and the God of Isaac, and the God of Jacob? He is not the God of the dead, but of the living: ye do greatly err" (Mark xii, 26 R. V.) Herein, in a form adapted to Jewish thought is "the one great argument which has made most sincere believers in God believers in Immortality also.

citing H. Rashdall: Doctrine and Development, Methuen, 1898 p. 177. - Spiritualism and the Christian Faith (1918)