The following comparisons between Freud's and Piaget's concepts are proposed: eros drive = constructive assimilation = direction toward the object in the sense of love for newness and otherness; death drive = constrictive assimilation = direction away from or destruction of the object out of fear for self to preserve the system. Eros and assimilation drive combine in the developing object and symbol formation to transform personal relations and knowledge. These psychological theories are further confirmed by evolutionary considerations about human social relations and by Macmurray's philosophy of personal relations as the primary function of reason.
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