I tried again this morning to find the passage in Maximus the Confessor mentioned by Basil in his commentary on Gregory Nazianzus. I still have not found the right passage, and I may not. But I have found something else of interest. Michael Psellos, the great Byzantine intellectual of the 11th century, has a passage in his Theologica (section 76) devoted to explaining the “διάφορα χαρισμάτων” (distinction of gifts, or type of gift) in Gregory’s Oration 41. About 1,000 words follow, in which he explains the passage from Gregory with what seems to be characteristic sophistication. I hope to check Gautier’s edition in print soon. Apparently there’s a short Latin introduction to each passage. I have very little knowledge of Michael, so I’ve to tread carefully if I wish to make use of him for interpreting Gregory.
This sort of thing shows just how valuable the TLG can be. It’s very unlikely I’d have found this passage otherwise. Soon though I’ll have to stop chasing little threads like this and come back to Gregory himself!