But the auditor of the proposed dogmas is supposed to be adorned with the moral virtues, and to be one who has bound by the reason of virtue all the illiberal and inharmonious motions of the soul, and harmonized them to the one form of intellectual prudence: for, as Socrates says, it is not lawful for the pure to be touched by the impure. But every vicious man is perfectly impure; and the contrary character is pure. He must likewise have been exercised in all the logical methods, and have contemplated many irreprehensible conceptions about analyses, and many about divisions, the contraries to these, agreeably, as it appears to me, to the exhortation of Parmenides to Socrates. For prior to such a contest in arguments, the knowledge of the divine genera, and of the truth established in them, is difficult and impervious. But in the third place, he must not be unskilled in physics. For he who has been conversant with the multiform opinions of physiologists, and has after a manner explored in images the causes of beings, will more easily advance to the nature of separate and primary essences. An auditor therefore of the present work, as I have said, must not be ignorant of the truth contained in the phenomena, nor unacquainted with the paths of erudition, and the disciplines which they contain; for through these we obtain a more immaterial knowledge of a divine essence. But all these must be bound together in the leader intellect. Being likewise a partaker of the dialectic of Plato, meditating those immaterial energies which are separate from corporeal powers, and desiring to contemplate by intelligence[85] in conjunction with reason [true] beings, our auditor must genuinely apply himself to the interpretation of divine and blessed dogmas, and fill his soul, according to the Oracle, with profound love; since, as Plato somewhere observes, for the apprehension of this theory, a better assistant than love cannot be obtained. He must likewise be exercised in the truth which pervades through all things, and must excite his intelligible eye to real and perfect truth. He must establish himself in a firm, immovable, and safe kind of divine knowledge, and must be persuaded not to admire any thing else, nor even to direct his attention to other things, but must hasten to divine light with an intrepid reasoning energy, and with the power of an unwearied life; and in short, must propose to himself such a kind of energy and rest as it becomes him to possess who intends to be such a coryphæus as Socrates describes in the Theætetus. Such then is the magnitude of our hypothesis, and such the mode of the discourses about it. Before, however, I enter on the narration of the things proposed, I wish to speak about theology itself, its different modes, and what theological forms Plato approves, and what he rejects; that these being previously known, we may more easily learn in what follows, the auxiliaries of the demonstrations themselves.