Combining Texts

You have chosen 'Three Dialogues of Hylas and Philonous' by George Berkeley, 'Presidential Address of Am. Math. Soc' by Oswald Veblen and 'The Meditations (To Himself)' by Marcus Aurelius

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction