The entire Oration runs for more than 10,000 words, so I am just quoting a few excerpts.
[See footnote for link to full text.]
“What I am now about to say I consider to be of the greatest importance for all things ‘that breathe and move upon the earth’ and have a share in existence and a reasoning soul and intelligence, but above all others it is of importance to myself. For I am a follower of King Helios. And of this fact I possess within me, known to myself alone, proofs more certain than I can give. But this at least I am permitted to say without sacrilege, that from my childhood an extraordinary longing for the rays of the god penetrated deep into my soul; and from my earliest years my mind was so completely swayed by the light that illumines the heavens that not only did I desire to gaze intently at the Sun, but whenever I walked abroad in the night season, when the firmament was clear and cloudless, I abandoned all else without exception and gave myself up to the beauties of the heavens…
“This divine and wholly beautiful universe, from the highest vault of heaven to the lowest limit of the earth, is held together by the continuous providence of the god, has existed from eternity ungenerated, is imperishable for all time to come, and is guarded immediately by nothing else than the Fifth Substance whose culmination is the beams of the Sun; and in the second and higher degree, so to speak, by the intelligible world; but in a still loftier sense it is guarded by the King of the whole universe, who is the centre of all things that exist. He, therefore, whether it is right to call him the Supra-Intelligible, or the Idea of Being, and by Being I mean the whole intelligible region, or the One, since the One seems somehow to be prior to all the rest, or, to use Plato's name for him, the Good; at any rate this uncompounded cause of the whole reveals to all existence beauty, and perfection, and oneness, and irresistible power; and in virtue of the primal creative substance that abides in it, produced, as middle among the middle and intellectual, creative causes, Helios the most mighty god, proceeding from itself and in all things like unto itself."
 Emperor Julian, see: http://www.sacred-texts.com/cla/toj/toj03.htm
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