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The main content of An enquiry concerning human understanding is empirical epistemology, including conceptual theory, causality and skepticism. It also includes ideas such as "miracles, providence, and the afterlife." Hume called his philosophy "the science of man", referring to the study of human nature as opposed to natural science. Therefore, Hume also called this science "the science of human nature". The so-called human nature here has a broad meaning, which includes the aspects related to human cognition, emotion, taste, morality and ritual behavior. The concept of "science of human nature" is in line with the rise of modern enlightenment, the advocation and attention of human nature, and is also a reflection of the trend of theoretical philosophy breaking up with natural science. In An enquiry concerning human understanding, Hume comprehensively analyzes human cognitive activities and points out that human cognitive ability is limited. Through the analysis of the philosophy of religion, atheism and absolute skepticism, Hume leads out his philosophy of "mild skepticism". As a moderate skeptic, Hume believes that a reasonable reasoner should always maintain a certain degree of doubt, caution and humility in all investigations and assertions. Mild skepticism or academic philosophy can be both durable and useful. The conclusion of philosophy is nothing but a systematic and revised reflection of everyday life, and Hume points out that the inherent problems of science and research to which one can seek are two: quantitative science, and the existence of reality and facts based entirely on experience. Hume goes on to argue that the best and most solid foundations of theology are faith and divine revelation; Morality and criticism are objects of interest and pleasure, not of understanding. Except books containing reasoning in numbers and quantities, and inferences about real facts and any experience of existence, the rest of the books contain nothing but sophistry and fantasy, which one may then throw into the fire.