Double charnière. Philosophie naturelle, métaphysique et perception dans les Principes de la Nature et de la Grace

To a certain extent, the Principles of Nature and Grace (PNG), of which the title alone already reminds Malebranche, still seem to be animated by the Leibnizian imitation of the 'Malebranche-Limbo' (the descending and ascending movement from God to creation, then horizontally to creatures, and then going back to souls, spirits and the kingdom of grace). Here we will highlight, on the contrary, the main aspects by which Leibniz diverges from it in the PNGs and in fact abandons it altogether. We will analyze the meaning of the bipartition of Leibnizian writing in two sections, 'physics' and 'metaphysics', on the background on Leibniz's classification of sciences and theory of the substance, and from there we will move to the consideration of the different levels of perception that Leibniz's substances present.