martin's i-it

according to martin, human have two attitudes towards the world and its beings: the i-it and i-thou. basically, i-it relationships are the once associated with beings to objects, while i-thou are associated with being to being relationships.

according to martin, not all being to being relationships are i-thou, why is this so?

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if a human being does not deserve to be treated as one, do you still treat him/ her as another human being or a being lower than your peer?