The article aims to illustrate the thought movement spanning from Kant to Hegel, outlining it as a process by which reason gradually and radically gains autonomy. The rational claim frees itself from all external authoritative bonds, moving towards a truth that can find its justification only in itself, as it cannot rest on anything outside its own realm. Both in Kant and Hegel, this movement is accompanied by what one may call a process of desubjectification of reason itself, that is – as aporetic as it might seem – the process of desubjectifying the subject. Key to this operation is the concept of dialectic, as rethought by both German philosophers. Hegel’s act of redetermination notably takes place through a radically different way of thinking the very notion of thought, with contradiction as a principle of determination of reality being the starting point.