The devout and fearless curiosity of Julian tempted the philosophers with the hopes of an easy conquest; which, from the situation of their young proselyte, might be productive of the most important consequences. Julian imbibed the first rudiments of the Platonic doctrines from the mouth of Ædesius, who had fixed at Pergamus his wandering and persecuted school. But as the declining strength of that venerable sage was unequal to the ardor, the diligence, the rapid conception of his pupil, two of his most learned disciples, Chrysanthes and Eusebius, supplied, at his own desire, the place of their aged master. These philosophers seem to have prepared and distributed their respective parts; and they artfully contrived, by dark hints and affected disputes, to excite the impatient hopes of the aspirant, till they delivered him into the hands of their associate, Maximus, the boldest and most skilful master of the Theurgic science. By his hands, Julian was secretly initiated at Ephesus, in the twentieth year of his age. His residence at Athens confirmed this unnatural alliance of philosophy and superstition. He obtained the privilege of a solemn initiation into the mysteries of Eleusis, which, amidst the general decay of the Grecian worship, still retained some vestiges of their primæval sanctity; and such was the zeal of Julian, that he afterwards invited the Eleusinian pontiff to the court of Gaul, for the sole purpose of consummating, by mystic rites and sacrifices, the great work of his sanctification. As these ceremonies were performed in the depth of caverns, and in the silence of the night, and as the inviolable secret of the mysteries was preserved by the discretion of the initiated, I shall not presume to describe the horrid sounds, and fiery apparitions, which were presented to the senses, or the imagination, of the credulous aspirant, till the visions of comfort and knowledge broke upon him in a blaze of celestial light. In the caverns of Ephesus and Eleusis, the mind of Julian was penetrated with sincere, deep, and unalterable enthusiasm; though he might sometimes exhibit the vicissitudes of pious fraud and hypocrisy, which may be observed, or at least suspected, in the characters of the most conscientious fanatics. From that moment he consecrated his life to the service of the gods; and while the occupations of war, of government, and of study, seemed to claim the whole measure of his time, a stated portion of the hours of the night was invariably reserved for the exercise of private devotion. The temperance which adorned the severe manners of the soldier and the philosopher was connected with some strict and frivolous rules of religious abstinence; and it was in honor of Pan or Mercury, of Hecate or Isis, that Julian, on particular days, denied himself the use of some particular food, which might have been offensive to his tutelar deities. By these voluntary fasts, he prepared his senses and his understanding for the frequent and familiar visits with which he was honored by the celestial powers. Notwithstanding the modest silence of Julian himself, we may learn from his faithful friend, the orator Libanius, that he lived in a perpetual intercourse with the gods and goddesses; that they descended upon earth to enjoy the conversation of their favorite hero; that they gently interrupted his slumbers by touching his hand or his hair; that they warned him of every impending danger, and conducted him, by their infallible wisdom, in every action of his life; and that he had acquired such an intimate knowledge of his heavenly guests, as readily to distinguish the voice of Jupiter from that of Minerva, and the form of Apollo from the figure of Hercules. These sleeping or waking visions, the ordinary effects of abstinence and fanaticism, would almost degrade the emperor to the level of an Egyptian monk. But the useless lives of Antony or Pachomius were consumed in these vain occupations. Julian could break from the dream of superstition to arm himself for battle; and after vanquishing in the field the enemies of Rome, he calmly retired into his tent, to dictate the wise and salutary laws of an empire, or to indulge his genius in the elegant pursuits of literature and philosophy.

The important secret of the apostasy of Julian was intrusted to the fidelity of the initiated, with whom he was united by the sacred ties of friendship and religion. The pleasing rumor was cautiously circulated among the adherents of the ancient worship; and his future greatness became the object of the hopes, the prayers, and the predictions of the Pagans, in every province of the empire. From the zeal and virtues of their royal proselyte, they fondly expected the cure of every evil, and the restoration of every blessing; and instead of disapproving of the ardor of their pious wishes, Julian ingenuously confessed, that he was ambitious to attain a situation in which he might be useful to his country and to his religion. But this religion was viewed with a hostile eye by the successor of Constantine, whose capricious passions alternately saved and threatened the life of Julian. The arts of magic and divination were strictly prohibited under a despotic government, which condescended to fear them; and if the Pagans were reluctantly indulged in the exercise of their superstition, the rank of Julian would have excepted him from the general toleration.