The doctrine was also an important part of the poetic program of the French Renaissance poets collectively referred to as La Pléiade (Pierre de Ronsard, Joachim du Bellay, etc.); a full theory of divine fury / enthusiasm was elaborated by Pontus de Tyard in his Solitaire Premier, ou Prose des Muses, et de la fureur poétique (Tyard classified four kinds of divine inspiration: (1) poetic fury, gift of the Muses; (2) knowledge of religious mysteries, through Bacchus; (3) prophecy and divination through Apollo; (4) inspiration brought on by Venus/Eros.)The divergent theories of inspiration that Swift satirized would continue, side by side, through the 18th and 19th centuries. Edward Young's Conjectures on Original Composition was pivotal in the formulation of Romantic notions of inspiration. He said that genius is "the god within" the poet who provides the inspiration. Thus, Young agreed with psychologists who were locating inspiration within the personal mind (and significantly away from the realm either of the divine or demonic) and yet still positing a supernatural quality. Genius was an inexplicable, possibly spiritual and possibly external, font of inspiration. In Young's scheme, the genius was still somewhat external in its origin, but Romantic poets would soon locate its origin wholly within the poet. Romantic writers such as Ralph Waldo Emerson (The Poet), and Percy Bysshe Shelley saw inspiration in terms similar to the Greeks: it was a matter of madness and irrationality.Materialist theories of inspiration again diverge between purely internal and purely external sources. Karl Marx did not treat the subject directly, but the Marxist theory of art sees it as the expression of the friction between economic base and economic superstructural positions, or as an unaware dialog of competing ideologies, or as an exploitation of a "fissure" in the ruling class's ideology. Therefore, where there have been fully Marxist schools of art, such as Soviet Realism, the "inspired" painter or poet was also the most class-conscious painter or poet, and "formalism" was explicitly rejected as decadent (e.g. Sergei Eisenstein's late films condemned as "formalist error"). Outside of state-sponsored Marxist schools, Marxism has retained its emphasis on the class consciousness of the inspired painter or poet, but it has made room for what Frederic Jameson called a "political unconscious" that might be present in the artwork. However, in each of these cases, inspiration comes from the artist being particularly attuned to receive the signals from an external crisis.

In modern psychology, inspiration is not frequently studied, but it is generally seen as an entirely internal process. In each view, however, whether empiricist or mystical, inspiration is, by its nature, beyond control.