"The sensitive eye can never be able to survey, the orb of the sun, unless strongly endued with solar fire, and participating largely of the vivid ray. Everyone therefore must become divine, and of godlike beauty, before he can gaze upon a god and the beautiful itself. Thus proceeding in the right way of beauty he will first ascend into the region of intellect, contemplating every fair species, the beauty of which he will perceive to be no other than ideas themselves; for all things are beautiful by the supervening irradiations of these, because they are the offspring and essence of intellect. But that which is superior to these is no other than the fountain of good, everywhere widely diffusing around the streams of beauty, and hence in discourse called the beautiful itself because beauty is its immediate offspring. But if you accurately distinguish the intelligible objects you will call the beautiful the receptacle of ideas; but the good itself, which is superior, the fountain and principle of the beautiful; or, you may place the first beautiful and the good in the same principle, independent of the beauty which there subsists."

“An Essay on the Beautiful" as translated into English by Thomas Taylor”

“It is by participation of species that we call every sensible object beautiful. Thus, since everything void of form is by nature fitted for its reception, as far as it is destitute of reason and form it is base and separate from the divine reason, the great fountain of forms; and whatever is entirely remote from this immortal source is perfectly base and deformed. And such is matter, which by its nature is ever averse from the supervening irradiations of form. Whenever, therefore, form accedes, it conciliates in amicable unity the parts which are about to compose a whole; for being itself one it is not wonderful that the subject of its power should tend to unity, as far as the nature of a compound will admit. Hence beauty is established in multitude when the many is reduced into one, and in this case it communicates itself both to the parts and to the whole. But when a particular one, composed from similar parts, is received it gives itself to the whole, without departing from the sameness and integrity of its nature. Thus at one and the same time it communicates itself to the whole building and its several parts; and at another time confines itself to a single stone, and then the first participation arises from the operations of art, but the second from the formation of nature. And hence body becomes beautiful through the communion supernally proceeding from divinity.”

“Plotinus" by Edward Moore, at Internet Encyclopedia of Philosophy”

“It is now time, leaving every object of sense far behind, to contemplate, by a certain ascent, a beauty of a much higher order; a beauty not visible to the corporeal eye, but alone manifest to the brighter eye of the soul, independent of all corporeal aid. However, since, without some previous perception of beauty it is impossible to express by words the beauties of sense, but we must remain in the state of the blind, so neither can we ever speak of the beauty of offices and sciences, and whatever is allied to these, if deprived of their intimate possession. Thus we shall never be able to tell of virtue's brightness, unless by looking inward we perceive the fair countenance of justice and temperance, and are convinced that neither the evening nor morning star are half so beautiful and bright. But it is requisite to perceive objects of this kind by that eye by which the soul beholds such real beauties. Besides it is necessary that whoever perceives this species of beauty, should be seized with much greater delight, and more vehement admiration, than any corporeal beauty can excite; as now embracing beauty real and substantial. Such affections, I say, ought to be excited about true beauty, as admiration and sweet astonishment; desire also and love and a pleasant trepidation. For all souls, as I may say, are affected in this manner about invisible objects, but those the most who have the strongest propensity to their love; as it likewise happens about corporeal beauty; for all equally perceive beautiful corporeal forms, yet all are not equally excited, but lovers in the greatest degree.”

“Hindu - Hinduism Dictionary on Plotinus”

“Bibliography by Richard Dufour”