Both Uses

opulent
in
Crediting Poetry, by Seamus Heaney
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So, partly as a result of having internalized these attitudes through growing up with them, and partly as a result of growing a skin to protect myself against them, I went for years half-avoiding and half —resisting the opulence and extensiveness of poets as different as Wallace Stevens and Rainer Maria Rilke; crediting insufficiently the crystalline inwardness of Emily Dickinson, all those forked lightnings and fissures of association; and missing the visionary strangeness of Eliot.†
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opulence = magnificence or luxury
And it is the unappeasable pursuit of this note, a note tuned to its most extreme in Emily Dickinson and Paul Celan and orchestrated to its most opulent in John Keats, it is this which keeps the poet's ear straining to hear the totally persuasive voice behind all the other informing voices.†

opulent = magnificent and luxurious

Definitions:

(1) (opulent)
magnificent and luxurious -- usually expensive
(2) (meaning too rare to warrant focus)
Much more rarely, opulent can reference a rich abundance of something; or that someone is rich.