"Zanoni", Book 4, Chapter X, by Edward Bulwer-Lytton

Chapter X:

Aeterna aeternus tribuit, mortalia confert
Mortalis; divina Deus, peritura caducus.
Aurel. Prud. contra Symmachum, lib. II.

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Regarding "the Indian sage", the author gives us this footnot: The Brahmins, speaking of Brahm, say, "To the Omniscient the three modes of being—sleep, waking, and trance—are not;" distinctly recognising trance as a third and coequal condition of being.

maya: in this case, almost certainly referring to the Hindu term for illusion. Or possibly from Buddhism, where it would be one of twenty subsidiary unwholesome mental factors, responsible for deceit or concealment about the nature of things. Similar, but more specific. Regardless, you get the gist of what the author is going for with this word.

Glendoveer: a heavenly sprite. But this is such an obscure word, I found only one source that even attempted to offer a pronunciation guide, so I have no confidence in what the pronunciation should be.

I mean, there's a golf course in Oregon by that name, but that's not going to be a reliable guide for how the word is used in this context.

The picture used is "Man Writing a Letter" by Gabriel Metsu in 1665. Sure, 125 years too early, so the fashion should be all wrong, but recall Zanoni is ancient, so his fashion sense might just be old fashioned. We aren't actually told one way or the other.

To follow along: https://www.gutenberg.org/files/2664/2664-h/2664-h.htm#link2HCH0048