There is some difficulty, when the subject is treated historically, in separating philosophy from science on the one hand, and from theology on the other. For in the early growth and development of human knowledge these three instruments of progress are so intertwined and inter dependent, have such closely related causal connections, and are made one, at least functionally, by nexi which can not be severed without fatality to all, that we are perforce required to take account of all when examining each.
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