1. The document discusses different philosophical concepts of the self from thinkers like Plato, Aristotle, Descartes, Locke, Hume, Freud, Kant, Ryle, and Merleau-Ponty.
2. Plato viewed the human soul as having three parts - rational, spirited, and appetitive - while Aristotle saw the soul as the essence of a person's being through intellect.
3. Descartes argued "I think therefore I am" and separated mind and body, while Hume believed there is no fixed self and it is simply a collection of perceptions.
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