But what is still more instructive is the exact justice which the clergy have dealt out to all those sovereigns with whom they were dissatisfied. Observe with what impartial candor St. Gregory of Nazianzen judges the emperor Julian, the philosopher. He declares that that prince, who did not believe in the existence of the devil, held secret communication with that personage, and that, on a particular occasion, when the demons appeared to him under the most hideous forms, and in the midst of the most raging flames, he drove them away by making inadvertently the sign of the cross. He denominates him madman and wretch; he asserts that Julian immolated young men and women every night in caves. Such is the description he gives of the most candid and clement of men, and who never exercised the slightest revenge against this same Gregory, notwithstanding the abuse and invectives with which he pursued him throughout his reign. To apologize for the guilty is a happy way of justifying calumny against the innocent. Compensation is thus effected; and such compensation was amply afforded by St. Gregory. The emperor Constantius, Julian's uncle and predecessor, upon his accession to the throne, had massacred Julius, his mother's brother, and his two sons, all three of whom had been declared august; this was a system which he had adopted from his father. He afterwards procured the assassination of Gallus, Julian's brother. The cruelty which he thus displayed to his own family, he extended to the empire at large; but he was a man of prayer, and, even at the decisive battle with Maxentius, he was praying to God in a neighboring church during the whole time in which the armies were engaged. Such was the man who was eulogized by Gregory; and, if such is the way in which the saints make us acquainted with the truth, what may we not expect from the profane, particularly when they are ignorant, superstitious, and irritable? At the present day the study of history is occasionally applied to a purpose somewhat whimsical and absurd. Certain charters of the time of Dagobert are discovered and brought forward, the greater part of them of a somewhat suspicious character in point of genuineness, and ill-understood; and from these it is inferred, that customs, rights, and prerogatives, which subsisted then, should be revived now. I would recommend it to those who adopt this method of study and reasoning, to say to the ocean, "You formerly extended to Aigues-Mortes, Fréjus, Ravenna, and Ferrara. Return to them immediately." SECTION III. _Of the Certainty of History._ All certainty which does not consist in mathematical demonstration is nothing more than the highest probability; there is no other historical certainty.