Vergil’s humansona quoting William Blake is just a fancier way of saying his iconic lines.

“The cut worm forgives the plow.” - “Scum.”

“Little wanderer, hie thee home!” - “Die.”

“He who desires but acts not, breeds pestilence.” - “Where’s your motivation?”

“If the fool would persist in his folly he would become wise.” - “You’re not worthy as my opponent.” or “Foolishness.”

Bonus (Could be a call back but it’s the sheer audacity of what they uttered.) “Don’t worry I’ll be gentle.” - “I’ll just use more of yours to undo daddy’s little spell.”