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.
(..) -It's pronounced "Dumbledore." - Dubbadore? You gotta write that down. I'm not gonna remember any of it. The Special will now give an eloquent speech. Oh, and this is the Piece of Resistance. Well, uh, I know that I, for one... ...am very excited to (..)2014 The Lego Movie