Combining Texts

You have chosen 'On the Happy Life' by Seneca the Younger, 'Critique of the Gotha Program' by Karl Marx and 'Answer to 'What is Enlightenment?'' by Immanuel Kant

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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