and simple conception on which the rest depends, those of unity, proportion, mass and motion in mathematics; those of organ, function and being in physiology; those of sensation, pain, pleasure and desire in psychology; those of utility, contract and law in politics and morality; those of capital, production, value, exchange in political economy, and the, same in the other sciences, all of these being conceptions derived from passing experience; from which it follows that, in appealing to common experience by means of a few familiar circumstances, such as short stories, anecdotes, agreeable tales, and the like, these conceptions are fashioned anew and rendered precise.  This being accomplished, almost everything is accomplished; for nothing then remains but to lead the listener along step by step, flight by flight, to the remotest consequences.

“Will Madame la Maréchale have the kindness to recall my definition? " — “I remember it well-do you call that a definition?” - “Yes.” -"That, then, is philosophy! " — “Admirable ! " — “And I have been philosophical? " — " As you read prose, without being aware of it.”

The rest is simply a matter of reasoning, that is to say, of leading on, of putting questions in the right order, and of analysis.  With the conception thus renewed and rectified the truth nearest at hand is brought out, then out of this, a second truth related to the first one, and so on to the end, no other obligation being involved in this method but that of carefully advancing step by step, and of omitting no intermediary step. — With this method one is able to explain all, to make everything understood, even by women, and even by women of society.  In the eighteenth century it forms the substance of all talents, the warp of all masterpieces, the lucidity, popularity and authority of philosophy.  The “Eloges” of Fontenelle, the “Philosophe ignorant et le principe d’action” by Voltaire, the " Lettre à M. de Beaumont,” and the “Vicaire Savoyard” by Rousseau, the “Traité de l’homme” and the “Époques de la Nature” by Buffon, the " Dialogues sur les blés” by Galiani, the " Considérations” by d’Alembert, on mathematics, the " Langue des Calculs” and the “Logique” by Condillac, and, a little later, the “Exposition du système du Monde” by Laplace, and “Discours généraux” by Bichat and Cuvier; all are based on this method[12].  Finally, this is the method which Condillac erects into a theory under the name of ideology, soon acquiring the ascendancy of a dogma, and which then seems to sum up all methods.  At the very least it sums up the process by which the philosophers of the century obtained their audience, propagated their doctrine and achieved their success.

III.  Its popularity.

Owing to style it becomes pleasing. — Two stimulants peculiar to the 18th century, coarse humor and irony.