An Enquiry Concerning Human Understanding is a book by the Scottish empiricist philosopher David Hume. This book has proven highly influential, both in the years that would immediately follow and today. Immanuel Kant points to it as the book which woke him from his self-described "dogmatic slumber".

The argument of the Enquiry proceeds by a series of incremental steps, separated into chapters which logically succeed one another. After expounding his epistemology, Hume explains how to apply his principles to specific topics.

I. Of the Different Species of Philosophy
II. Of the Origin of Ideas
III. Of the Association of Ideas
IV. Sceptical Doubts Concerning the Operations of the Understanding
V. Sceptical Solution of these Doubts
VI. Of Probability
VII. Of the Idea of Necessary Connexion
VIII. Of Liberty and Necessity
IX. Of the Reason of Animals
X. Of Miracles
XI. Of a Particular Providence and of a Future State
XII. Of the Academical or Sceptical Philosophy

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