In respect to them, the final result was found in a series of irreducible notions or categories, the prima possibilia, the analysis and elucidation of which was specifically the business of philosophy or metaphysics.
His great literary activity was chiefly devoted to the elucidation of the writings of Plato.
These admissions, together with his elucidation of the idea of doctrinal development and his eloquent assertion of the supremacy of conscience, have led some critics to hold that, in spite of all his protests to the contrary, he was himself somewhat of a Liberal.
Among his most important work was the elucidation of Old French by means of the many glosses in the medieval writings of Rashi and other French Jews.
Considerable progress has been made in the publication and elucidation of these original authorities.