"I am unable, when I turn to myself, to recognize any of my faculties or my capacities. The inner sensation which I have of myself informs me that I am, that I think, that I will, that I have sensory awareness, that I suffer, and so on; but it provides me with no knowledge whatever of what I am - of the nature of my thought, my sensations, my passions, or my pain - or the mutual relations that obtain between all these things ... I have no idea whatever of my soul."

Source : "Dialogues on Metaphysics". Book by Nicolas Malebranche, Dialogue III, 1688.

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