 a priori justification and knowledge |  Aristotle |  Bacon, Francis |  Descartes, René |  Hegel, Georg Wilhelm Friedrich |  Heidegger, Martin |  Hume, David |  idealism |  Kant, Immanuel |  Plato |  Ricoeur, Paul |  Scottish Philosophy: in the 18th Century |  Spinoza, Baruch 