“In a broader sense we can talk about a naturalistic current from the middle of the nineteenth century until quite far into our own. By ‘naturalistic’ we mean a sense of reality that accepts no other reality than nature and the sensory world. A naturalist therefore also considers mankind to be part of nature. A naturalistic scientist will exclusively rely on natural phenomena—not on either rationalistic suppositions or any form of divine revelation.” “And that applies to Marx, Darwin, and Freud?”
