Background and Context
Nouvelles libertés de penser (New Freedoms of Thought) is a short work by Bernard le Bovier de Fontenelle (1657–1757), the French writer, philosopher, and perpetual secretary of the Académie française and the Académie des sciences. Fontenelle was among the most widely read popularizers of the new science and philosophy of the late seventeenth and early eighteenth centuries. His reputation rests on his Entretiens sur la pluralité des mondes (Conversations on the Plurality of Worlds, 1686), which introduced Cartesian and Copernican cosmology to a salon audience through a witty dialogue between a philosopher and a marquise, and on his Histoire des oracles (1686), a critique of ancient oracles that anticipated later debates on credulity and religious history.
New Freedoms of Thought belongs to this same current of writing: it is an argument for intellectual independence, urging readers to think for themselves, to examine received opinion, and to free the mind from the authority of tradition and unexamined belief. The work is typical of Fontenelle’s method, which combines lucidity, a light and ironic tone, and a deliberate avoidance of pedantry, so that serious philosophical content reaches an educated general public rather than only specialists.
The Central Thesis
The book’s core claim is that the human mind has been constrained by authority, habit, and inherited doctrine far more than by any natural incapacity, and that the progress of knowledge depends on loosening these constraints. Fontenelle presents the “new” freedoms as liberties newly available to thinkers of his age, made possible by the advances of the natural sciences and by a more critical attitude toward the ancients. The freedom he describes is not a license for anarchy in thought but a disciplined willingness to test claims by reason and observation, to accept nothing merely because it is old, widely held, or delivered by a respected name.
Fontenelle’s argument is that intellectual servitude takes several forms. There is the servitude of deference to antiquity, in which the moderns are taught that the ancients said everything worth saying and that originality is presumptuous. There is the servitude of custom, in which opinions are accepted because they are familiar and their rejection would be socially uncomfortable. And there is the servitude of institutions, which may enforce orthodoxy in matters of belief and learning. Against these, the book proposes a freedom of judgment that is compatible with respect for the past but does not subordinate reason to it.
The Structure of the Argument
The work proceeds by a sequence of reflections rather than a rigid deductive system, in keeping with the essayistic and conversational character of Fontenelle’s writing. It moves from general considerations about the nature of thought and error toward more specific applications to the sciences, to history, and to the question of how readers and writers should relate to tradition.
The opening movement establishes the psychological foundations of the argument. Fontenelle observes that most people think less from their own reasoning than from the ready-made opinions they have absorbed, and that the comfort of these opinions makes them reluctant to examine them. Error persists not only because it is false but because it is easy and familiar. The first task of the free mind, on this account, is to recognize how much of what it believes it has never really examined.
The middle part of the book turns to the relationship between the ancients and the moderns, a debate that was very active in France during Fontenelle’s lifetime, notably in the Querelle des Anciens et des Modernes. Fontenelle’s position in this quarrel was generally on the side of the moderns, but his contribution here is less polemical than philosophical. He argues that the accumulation of knowledge over time is a genuine phenomenon, that later thinkers can build on earlier discoveries and correct their mistakes, and that reverence for the ancients should not become a barrier to new inquiry. Admiration for the great writers of antiquity is not the same as the belief that nothing more can be discovered.
The later sections examine the practical conditions under which free thought can flourish. Fontenelle considers the role of education, arguing that students are often trained to memorize doctrine rather than to reason, and that this produces minds accustomed to accepting authority. He also considers the social dimension of thought: the desire to be agreeable, the fear of ridicule, and the pressure to conform all discourage independent judgment. The free thinker must therefore cultivate both intellectual rigor and a certain detachment from social expectations, though Fontenelle is careful to advise that such detachment should be exercised with tact rather than provocation.
Central Ideas and Examples
Among the recurring ideas of the work is the claim that the advancement of the sciences is a model for the freedom of thought more generally. The sciences, Fontenelle suggests, show that it is possible to establish truths through observation, experiment, and calculation, and that these truths can be revised when new evidence appears. The willingness to revise is precisely what distinguishes a free mind from a dogmatic one. He returns to the astronomical and physical discoveries of his time as illustrations of how established opinions were overturned by patient inquiry, and he presents these overturnings as cause for hope rather than anxiety.
Another important theme is the relation between authority and evidence. Fontenelle does not reject all authority; he recognizes that no one can verify everything personally, and that reliance on trustworthy testimony is a necessary part of life. The difference between healthy and unhealthy reliance lies in whether one remains capable of judging the grounds of belief and of withdrawing assent when those grounds are insufficient. The free mind knows where its knowledge comes from and remains open to correction.
The book also exhibits Fontenelle’s characteristic irony toward credulity. Drawing on the same critical spirit found in his Histoire des oracles, he treats popular superstitions and the inherited marvels of the past with a mixture of amusement and seriousness, showing how easily human beings accept accounts that flatter their expectations or confirm their fears. The critique is aimed less at the individuals who hold such beliefs than at the habits of mind that sustain them.
Style and Method
The work is written in the clear, graceful French prose for which Fontenelle was celebrated. Its tone is measured and often playful, avoiding the heavy scholastic apparatus that marked much learned writing of the period. Fontenelle addresses an educated reader who is not necessarily a specialist, and he takes care to make abstract questions concrete through comparison and illustration. This accessibility was itself part of his argument: free thought, in his view, should not be the privilege of a learned elite but something that intelligent people of any background could exercise.
Significance and Reception
New Freedoms of Thought is significant as an early expression of the Enlightenment ideal of intellectual autonomy, anticipating themes later developed more fully by writers such as Voltaire, d’Alembert, and the encyclopedists. Its emphasis on the provisional character of knowledge, the value of scientific method, and the dangers of unexamined authority became central to Enlightenment thought. Fontenelle’s own reputation in his lifetime was very considerable; he was regarded as a model of the modern man of letters who could combine scientific understanding with literary elegance.
The book’s influence lies less in any single doctrine than in the attitude it promotes. By presenting free thought as a discipline of reason, tempered by humility and social awareness, Fontenelle offered his readers a way of relating to knowledge that remained open to revision and resistant to the comfortable certainties of custom. In this respect the work stands as a characteristic document of its age and a precursor of the critical spirit that would shape the eighteenth century.
