He 'waxed eloquent' [=he said many things] on/about the pleasures of gardening.
His success serves as an 'eloquent' reminder of the value of hard work.
She spoke 'eloquently' about the need for better schools.
(..) And while she's gone, you want her advisors to be worshipped and obeyed. I'd settle for obeyed. I will summon my most eloquent priests. They will spread the word. Daenerys has been sent to lead the people against the darkness in this war and in the great war still to come. (..)2016 TvShow: Game of Thrones Title: The Door Season: 6 Episode 5