“Oh, prithee say no more; ‘tis glorious? If that I could but clothe me in raiment like to thine, and strip my feet, and revel in the mud once, just once, with none to rebuke me or forbid, meseemeth I could forgo the crown!”
Paraphrase: Oh, please, stop! What you're saying sounds amazing! If, just once, I could wear your clothes and play in the mud without being scolded, I would give up the crown!