Hinduism, and developed those social customs which have become walls of
adamant? How could Buddhism grow out of such a soil and finally cast its
spell over so many peoples? What were the elements of power which
enabled the great sage of China to rear a social and political fabric
which has survived for so many centuries? How was it that Islam gained
its conquests, and what is the secret of that dominion which it still
holds? These surely are questions worthy of those who are called to deal
with human thought and human destiny. And when by comparison we find the
grand differentials which raise Christianity infinitely above them all,
we shall have gained the power of presenting its truths more clearly and
more convincingly to the minds and hearts of men.

There are some specific advantages flowing from the study of other
religions of which I will give little more than an enumeration.

1. It impresses us with the universality of some more or less distinct
conception of God. I am aware that from time to time explorers imagine
that they have found a race of men who have no notion of God, but in
almost every instance subsequent investigation has found a religious
belief. Such mistakes were made concerning the aborigines of Australia,
the Dyaks of Borneo, the Papuans, the Patagonians, and even the American
Indians. The unity of the race finds a new and striking proof in the
universality of religion.

2. The study of false systems brings to light an almost unanimous
testimony for the existence of a vague primeval monotheism, and thus
affords a strong presumptive corroboration of the Scriptural doctrine of
man's apostasy from the worship of the true God.

3. The clearest vindication of the severities of the Old Testament