Proclus' triad of goodness, wisdom, and beauty:
"Now there are three substantial natures among the intelligible and hidden gods, and the first is characterized by the good where lies the paternal monad, the second by wisdom where lies the first intelligent perception, and the third by beauty, where lies the most beautiful of the intelligibles, as is the account of Timaeus (30d); three monads subsist in accordance with these intelligible causes, causally and unitarily existing in the intelligibles, but first revealed in the "unutterable" order of the gods, viz. "faith" and "truth" and "love"; the first founding the universe and establishing it in the good, the second revealing the knowledge that lies in all beings, the third turning back everything and uniting it to the nature of the beautiful. This triad proceeds thenceforth to all the divine orders and radiates to all union with the intelligible; it reveals itself differently according to the different orders, combining its own functions with the individual characters of the gods. Sometimes, as we said, it is present in a manner unspeakable, unknowable and unitary, sometimes as holding and binding together , sometimes as perfective and formative: sometimes intelligently and paternally, sometimes as imparting movement and life and productively ; sometimes sovereignly and assimilatively, sometimes freely and purely, sometimes in multiplication and division. From above, then, love ranges from the intelligibles to the intra-mundane making everything revert to the divine beauty, truth illuminating the universe with knowledge, and faith establishing each reality in the good. "For everything," says the oracle "is governed and exists in these three"; and for this reason the gods advise the theurgists to unite themselves to God through this triad."
- Proclus, Commentary on Plato's Alcibiades, trans. William O'Neill, 1965, 51-3, pp. 31-3