But in the Philebus, Plato delivers to us the three most principal elements of the good, viz. the desirable, the sufficient, and the perfect. For it is necessary that it should convert all things to itself, and fill all things, and that it should be in no respect deficient, and should not diminish its exuberance. Let no one therefore conceive the desirable to be such as that which is frequently extended in sensibles as the object of appetite. For such is apparent beauty.
Nor let him suppose it to be such as is indeed able to energize upon and excite to itself the natures which are able to participate it, but which at the same time may be apprehended by intelligence, and is educed by us according to a projecting energy, and an adhesion of the dianoetic power. For it is ineffable, and prior to all knowledge extends to all beings. For all things desire the good, and are converted to it. But if it be requisite summarily to unfold the characteristic peculiarity of the desirable, as the supplier of light proceeds by his rays into secondary natures, converts the eye to himself, causes it to be solar-form, and to resemble himself, and through a different similitude conjoins it with his own fulgid splendor, thus also I think the desirable of the Gods allures and draws upward all things to the Gods in an ineffable manner by its own proper illuminations, being everywhere present to all things, and not deserting any order whatever of beings.
Since even matter itself is said to be extended to this desirable, and through this desire is filled with as many goods as it is able to participate. It is therefore the center of all beings, and all beings, and all the Gods have their essences, powers and energies about this. And the extension and desire of things towards this is inextinguishable. For all beings aspire after this desirable which is unknown and incomprehensible. Not being able therefore either to know or receive that which they desire, they dance round it, and are parturient and as it were prophetic with respect to it. But they have an unceasing and never-ending desire of its unknown and ineffable nature, at the same time that they are unable to embrace and embosom it. For being at once exempt from all things, it is similarly present to and moves all things about itself, and is at the same time by all of them incomprehensible.
By this motion also and this desire it preserves all things. But by its unknown transcendency through which it surpasses the whole of things, it preserves its proper union unmingled with secondary natures. Such therefore is the desirable.
But the sufficient is full of boniform power, proceeds to all things, and extends to all beings the gifts of the Gods. For we conceive such a sufficiency as this to be a power pervading and protending to the last of things, extending the unenvying and exuberant will of the Gods, and not abiding in itself, but unically comprehending the super-plenitude, the never-failing, the infinite, and that which is generative of good in the divine hyparxis.
For the desirable being firmly established, and surpassing the whole of things, and arranging all beings about itself, the sufficient begins the progression and multiplication of all good, calls forth that which is primary in the uniform hyparxis of the desirable, by its own prolific exuberance, and by the beneficent replenishings which pervade to all things, and copiously produces and imparts it to every being. It is owing to the sufficient therefore, that the stability of divine natures, and that which proceeds from its proper causes is full of goodness, and that, in short, all beings are benefited, abiding in, proceeding from, and being united to their principles, and essentially separated from them. Through this power therefore, the intellectual genera give subsistence to natures similar to themselves, souls desire to generate, and imitate the beings prior to souls, natures deliver their productive principles into another place, and all things possess, in short, the love of generation. For the sufficiency of the goodness of the Gods, proceeding from this goodness, is disseminated in all beings, and moves all things to the unenvying communication of good; intellect indeed to the communication of intellectual, but soul of psychical, and nature of natural good.
All things therefore abide through the desirable of goodness, and generate and proceed into second and third generations through the sufficient. But the third thing, the perfect, is convertive of the whole of things, and circularly collects them to their causes; and this is accomplished by divine, intellectual, psychical and physical perfections. For all things participate of conversion, since the infinity of progression is through this again recalled to its principles; and the perfect is mingled from the desirable and sufficient. For everything of this kind is the object of desire, and is generative of things similar to itself. Or in the works of nature also, are not perfect things everywhere lovely and prolific through the acme of their beauty? The desirable therefore establishes all things, and comprehends them in itself. The sufficient excites them into progressions and generations. And the perfect consummately leads progressions to conversions and convolutions. But through these three causes, the goodness of the Gods fixing the unical power and authority of its proper hypostasis in this triad, is the primary and most principal fountain and vestal seat of things which have any kind of subsistence whatever.