  Kant placed great emphasis on the unity of consciousness, both positively and negatively. Positively, he held that conceptualized representation has to be unified both at and across time. Negatively, from a mind having unified consciousness, he held that nothing follows concerning its composition, its identity, especially its  identity across time,  nor its materiality or immateriality. He argued these points in his attacks on the second, third and fourth Paralogisms.