But we can go further than this. It is not merely true that we can find in the world about us the signs of an Intelligence like our own, it is also true that our own intelligence has been developed by the revelation to us of this Intelligence in the world about us. "If," says Walker, "human reason is but 'the reflection in us of the universe outside of us,' then, clearly, the Reason was there, expressed in the universe, before it possibly could be reflected in us. It is _our relation to the Universe that makes us rational_." And again, "Apart from the Reason expressed in the Universe around him, man could never have become the rational being that he is."[7] This, then, is the first great reason why our religion has gradually become more rational. The rationality of the universe constantly presented to our thought has developed a rationality in our thoughts about the universe. The mind, like the dyer's hand, is subdued to what it works in. The response of primitive man to the pressure of Nature upon him was a response of wonder and awe and fear; his religion was instructive, emotional; but through the long tuition of the ages, the old nurse has taught him how to use his reason; and he now finds unity where he once found strife, and order and law where once confusion and chaos reigned. His religion has become rational. But what do we mean when we say that man's great teacher has been Nature? Nature, as we have seen, is instinct with Reason, and the Reason which is revealed in Nature is only another name for God. It is the immanent God, the Eternal Reason, who has been patiently disclosing himself to us in the world round about us, and thus cleansing our minds from the crude and superstitious conceptions with which in our ignorance and fear we had invested him. The second of the sources from which the influences have come for the purification of religion is humanity itself.