20. The simple fact that is possible to communicate with beings of the spiritual world opens up to us incalculable consequences of the highest gravity and importance. Here a new world is revealed to us, and one which is so much the more important in that it awaits all men without exception! Knowledge concerning it cannot fail to produce, in a general sense, a profound modification in the customs, character, habits, and beliefs which exert so great an influence upon man’s social life. It has caused a revolution in ideas, a revolution so great and powerful that it is not circumscribed to any one people, much less to one caste, but reaches simultaneously the heart of all classes, all nationalities, all civilizations.
For the best of reasons, Spiritism is considered the third grand revelation. Let us see wherein the revelations differ, and how they are attached to one another.