Thus we uncover a system of the powers of the mind in their relation to nature and to freedom, both of which possess their own distinctive determining a priori principles and which therefore constitute the two parts of philosophy as a doctrinal system (theoretical and practical philosophy), as well as a transition from the sensible substrate of the former to the intelligible substrate of the latter by means of the power of judgement which connects both parts through a distinctive principle of its own; this transition is accomplished through the critique of a faculty (the power of judgement) whose function is simply connective and which cannot therefore furnish any knowledge on its own account or make any contribution to doctrine, but whose judgements called aesthetic (possessing merely subjective principles) as distinct from those called logical (whether theoretical or practical) which necessarily possess objective principles are of a special kind in that they relate sensuous intuitions to an idea of nature whose conformity to law cannot be understood except in relation to a supersensible substrate.