To all the brave men and women, humble or learned, who have the moral courage during seventy years to face ridicule or worldly disadvantage in order to testify to an all-important truth. Many more philosophic minds than mine have thought over the religious side of this subject and many more scientific brains have turned their attention to its phenomenal aspect. So far as I know, however, there has been no former attempt to show the exact relation of the one to the other. I feel that if I should succeed in making this a little more clear I shall have helped in what I regard as far the most important question with which the human race is concerned.…
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