Diderot and the Philosophy of the Encyclopédie

Denis Diderot’s philosophical vision for the Encyclopédie was one of the most ambitious intellectual projects of the eighteenth century. The vision was based on a comprehensive account of knowledge, a commitment to the dissemination of knowledge as a means of human improvement, and a thoroughgoing rejection of the established institutions that Diderot considered to be obstacles to human progress. This article examines Diderot’s philosophical vision for the Encyclopédie, including his conception of knowledge, his views on progress, and his lasting influence on modern thought.

The Conception of Knowledge

Diderot’s conception of knowledge was thoroughly Enlightenment in character. Knowledge, in his view, was a systematic and comprehensive body of understanding that could be acquired through the proper use of human reason, and it was the proper foundation of the moral and political life.

The conception was based on three main commitments. The first commitment was to the unity of knowledge. Diderot believed that all the various branches of knowledge were interconnected, and that the proper organization of knowledge required a recognition of the relationships among the various branches. The Encyclopédie was, in his view, the proper instrument for the organization of knowledge, since it allowed the various branches to be presented in their interconnections.

The second commitment was to the accessibility of knowledge. Diderot believed that knowledge was not the exclusive possession of the learned elite, but the proper inheritance of all human beings. The Encyclopédie was, in his view, the proper instrument for the dissemination of knowledge, since it made the various branches accessible to a wide audience through clear writing, accurate description, and detailed illustration.

The third commitment was to the practical application of knowledge. Diderot believed that knowledge was not an end in itself, but a means to the improvement of the human condition. The Encyclopédie was, in his view, the proper instrument for the application of knowledge, since it provided the information necessary for the practical arts, the manufacturing processes, and the various other activities that contributed to the improvement of human life.

The Views on Progress

Diderot’s views on progress were characteristic of the Enlightenment commitment to the possibility of human improvement. He believed that human beings were capable of improving their condition through the proper use of reason, and that the proper use of reason required the systematic cultivation of the various faculties of the human mind.

The views were grounded in a comprehensive account of the history of civilization. Diderot believed that the human race had made significant progress over the course of its history, and that the proper response to this progress was to continue the work of improvement. The Encyclopédie was, in his view, an important contribution to this work, since it helped to make the achievements of the human mind available to future generations.

The views were also grounded in a comprehensive account of the obstacles to progress. Diderot believed that the established institutions of the Old Regime — the monarchy, the aristocracy, the church, the various other institutions that perpetuated the existing order — were obstacles to the progress of the human race. The proper response to these obstacles, in his view, was a thoroughgoing reformation of the institutions of the political and social life, and the Encyclopédie was, in his view, an important contribution to this reformation.

The Methodology of the Encyclopédie

The methodology of the Encyclopédie was based on a comprehensive account of the proper way to organize and present knowledge. The methodology was developed in collaboration with d’Alembert’s Preliminary Discourse, which provided a systematic analysis of the structure of knowledge and the proper way to organize it.

The methodology was based on three main principles. The first principle was the principle of the systematic organization. The Encyclopédie was organized according to a system that reflected the structure of human knowledge, with the various branches arranged in their proper relationships. The organization was designed to allow the reader to navigate the work and to find the information that he was looking for.

The second principle was the principle of the cross-referencing. The Encyclopédie was designed to allow the reader to follow the connections among the various branches of knowledge through a system of cross-references. The cross-references were designed to highlight the interconnections among the various branches and to help the reader develop a comprehensive understanding of the structure of knowledge.

The third principle was the principle of the illustration. The Encyclopédie was designed to include detailed illustrations of the various subjects treated in the work. The illustrations were designed to convey the visual aspects of the various subjects and to help the reader develop a concrete understanding of the various branches of knowledge.

The Political Stakes of the Encyclopédie

The Encyclopédie was, in important respects, a politically engaged work. Diderot was committed to the use of the new knowledge as a means of criticizing the established order, and he used the various entries of the Encyclopédie to advance the cause of the new philosophy.

The political engagement was most evident in the entries on politics, religion, and philosophy. The entries on these subjects were often written or commissioned to advance the cause of reason, liberty, and progress, and they subjected the established institutions of the Old Regime to a systematic critical examination.

The most politically controversial entries were the entries on “Authority,” “Political Authority,” “Ecclesiastical Power,” and “Intolerance.” These entries were widely read and widely discussed, and they helped to establish the Encyclopédie as a manifesto of the new philosophy.

The political engagement of the Encyclopédie was, in Diderot’s view, a necessary consequence of the philosophical vision. The proper dissemination of knowledge required the confrontation of the established institutions that were obstacles to the progress of the human race, and the Encyclopédie was, in his view, the proper instrument for this confrontation.

The Legacy of Diderot’s Vision

Diderot’s philosophical vision for the Encyclopédie has had a lasting influence on the development of modern thought. The vision of knowledge as a comprehensive and accessible body of understanding, the commitment to the dissemination of knowledge as a means of human improvement, the political engagement of the intellectual life — all of these are descendants of Diderot’s vision.

The most important lasting influence is on the development of the modern encyclopedia. The contemporary encyclopedia, with its comprehensive scope, its systematic organization, its accessibility to a wide audience, is a direct descendant of Diderot’s Encyclopédie. The contemporary practices of online encyclopedias, with their emphasis on the accessibility of knowledge to a global audience, are also descendants of Diderot’s vision.

The second most important lasting influence is on the development of the modern intellectual life. The contemporary practice of the engaged intellectual, with its emphasis on the application of knowledge to the practical problems of human life, its commitment to the political engagement of the intellectual life, is a direct descendant of Diderot’s vision.

Further Reading

• The Stanford Encyclopedia of Philosophy (plato.stanford.edu), relevant entry
• The Cambridge Companion to [Thinker] (Cambridge University Press)
• Isaiah Berlin, Four Essays on Liberty (1969)