In the present century the spread of the scientific spirit, which counts no facts unworthy of notice, together with the attention bestowed on the history of doctrine, and the special interest in understanding the fortunes of free thought, which sympathy in danger created during the rationalist movement, prevented the historians from passing lightly over so important a series of facts. It may be sufficient to instance, in proof, the notices of unbelief [pg xviii] which occur in Neander's Church History. General histories also of literature, like Schlosser's History of Literature in the Eighteenth Century, or the more theological one of Hagenbach (Geschichte des 18n Jahrhunderts) incidentally afford information.
The various works just named are the chief of this class which furnish assistance.
3. After a general preliminary idea of the history has been obtained from these sources, in order to prevent being confused with details; it is necessary to resort next to the original sources of information, without careful study of which the history must lack a real basis.
In reference to the early unbelievers, the direct materials are lost; but the contemporary replies to these writings remain. In the case of later unbelievers, both the works and the answers to them exist. It will be presumed that in so large a subject the writer cannot have read all the sceptical works which have been written, and are here named. With the exception however of Averroes and of the Paduan school,[27] in which cases he has chiefly adopted second-hand information, and merely himself consulted a few passages of the original writers, he has in all other instances read the chief works of the sceptical writers, sufficiently at least to make himself acquainted with their doubts, and in many cases has even made an analysis of their works. The reader will perceive by the foot-notes the instances in which this applies.
It may be due to some of the historians who have made a special study of particular periods from original sources, to state, that so far as his limited experience extends he can bear witness to their exactness. Leehler's work on English deism, for example,[28] is a singular example of truthful narrative; and Leland's,[29] though controversial, is worthy of nearly the same praise.
4. There remains a fourth source of materials in the separate monographs on particular men, opinions, or schools of thought. We shall enumerate these according to the order of the lectures; dwelling briefly on the majority of them, as being described elsewhere; and describing at greater length those only which relate [pg xix] to the history of the theological movements in Germany described in Lectures [VI.] and [VII.]; inasmuch as references are there frequently made to these works without a specific description of their respective characters.
In relation to the early struggle of Paganism against Christianity,[30] the work of Lardner, Collection of Ancient Jewish and Heathen Testimonies to the Truth of the Christian Religion (1764-7) (Works, vols. vii.-ix.), is well known for carefulness of treatment and the value of its references. Portions also of the works of J. A. Fabricius, especially his Bibliotheca Græca and Lux Evangelii (1732) are useful in reference to the lost works, and for bibliographical knowledge: also a monograph by Kortholt, Paganus Obtrectator (1703), on the objections made by Christians in the early ages, gathered from the Apologies.
Among recent works it is only necessary to specify one, viz. the second series of the Histoire de l'Eglise Chrétienne, by E. de Pressensé (1861), containing La Grande Lutte du Christianisme contre le Paganisme, the account of the struggle both of deeds and ideas on the part of the heathens against Christianity, and of the apology of the Christians in reply. The sketches of the arguments used both by the heathens, as recovered from fragments, and by the Christian apologists, are most ably executed. The frequent references to it in the foot-notes will show the importance which the writer attaches to this work.[31]
The long period of the middle ages, together with early modern[32] history, so far as the latter bears upon the present subject, is spanned by the aid of four works; Cousin's Memoir on Abelard (1836); the La Reforme of Laurent (1861), a professor at Ghent; the Averroes of E. Renan (1851), one of the ablest among the younger writers of France; and the Essais de Philosophie Religieuse of E. Saisset (1859). All these works are full of learning; some of them are works of mind as well as of erudition. Cousin's treatise is well known,[33] and may be said to have reopened the study of medieval philosophy. The contents of Laurent's work are specified elsewhere.[34] That of Renan, besides containing a sketch of the life and philosophy of Averroes, studies [pg xx] his influence in the three great spheres where it was felt,—the Spanish Jews, the Scholastic philosophers, and the Peripatetics of Padua. The work of Saisset is a most instructive critical sketch on religious philosophy.
The period of English Deism[35] is treated in two works; the well-known work of Leland above cited, and the one also named above by Lechler, now general superintendent at Leipsic; a work full of information, and exceedingly complete; one of the carefully executed monographs with which many of the younger German scholars first bring their names into notice. Though the interest of the subject is limited, it well merits a translator.[36]