An Inquiry Concerning Human Understanding is one of the central works of Scottish thinker David Hume and one of the most important works of Enlightenment philosophy. In it, Hume gives a general theoretical understanding of the fundamental principles of human thought and perception, which he revealed throughout his entire creative activity in a wide variety of subject areas - ethical, political, economic, aesthetic, religious, etc. This book again riveted attention at the beginning of the 21st century in the most relevant directions of modern philosophy. The publishing layout is saved in a4.pdf format.