" This new philosophical psychology can in this respect be traced back to Maine de Biran, for even if in his time scientific psychology was unaware of its autonomy, and even if Biranian psychology was only critical of that of the empiricists, Biran believed in the Kantian distinction of noumena and phenomena and took care to limit his inquiry to the latter alone, which did not prevent him from extending it in the form of idealist speculations. "

― Jean Piaget , Insights and Illusions of Philosophy: Selected Works Vol 9