sentences:  Ultimately, the Discourse defines two ways of approaching ideas, one of which being operations of the "isolated mind" (xli) and the other concerning studies of the origins of truth as a function of the progress of a given society.Although the Discourse derives much of its fundamental principles from men such as René Descartes, John Locke and Condillac in a purely metaphysical sense, the effect of historical experience is vital.It is important to note that while the philosophes began the intellectual transformations that became known as the French Enlightenment, scientists all over Europe began to make their own changes in terms of new discoveries, areas they felt required further study, and how they could go about such studies, i.e.