Proclus, Theologia Platonica; Michael Psellos

...he willed to implant the notions concerning the gods in all his own offspring, and to leave nothing without a share of the memory of the divine; so that from all things one might be led up and achieve a recollection of the wholes, as belongs to the genuine lovers of the gods. As for those dialogues which especially reveal the mystagogy concerning the gods to us, having prioritized them among the many dialogues, I should not be slow to enumerate the Phaedo and the Phaedrus, the Symposium, and the Philebus; and again, along with these, the Sophist and the Statesman, as well as the Cratylus and the Critias. For all these are the foundations of the soul of Plato, which they happen to be from as if from a foreign spring. Among others known along with these [one should include] the Timaeus and the first-born work, and the companion laws regarding the providence of the gods, and those regarding the Fates; whether they be those of the Fates or those concerning the revolutions of the universe, the high-mindedness of the Republic will demonstrate them to us. And if you wish to speak even better, consider if the Epistles perhaps allow us to rest upon the knowledge concerning divine things as far as was possible for him. For in these he knew the King of the gods; and many other divine dogmas are naturally preserved by Plato. It is necessary, therefore, looking toward these, to lead up our mind to the gods and to seek within these. And to receive from the Philebus the doctrine concerning the One Good and the principle of the foremost gods; and their subsistence will be revealed through this science. For let all these things be said to be rightly judged and handed down to us by Plato. From the Timaeus, one receives the contemplation concerning the intelligibles, and that concerning the demiurgic monad—which is a divine guidance—and that concerning the encosmic gods, to fill them with a certain perception. From the Phaedrus, all the intelligible and intellectual genera, and the absolute orders of the gods, as many as are proximately established above their own models. From the Statesman, the demiurgy within its own realm, and the doctrines concerning the periods of the universe and their generations themselves once more.