The letter conveys heartfelt gratitude for a gift of nine volumes of fine literature, sent from Amsterdam by an unknown benefactor, and appeals to Voltaire to help identify this esteemed anonymous donor.

Additionally, T. D. N. Besterman notes that Caussy misidentified the sender, mistakenly referring to him as ‘Moisnel’.

Frederick writes that he has a fever and does not think he will be well enough to travel to Antwerp and Brussels as he had planned. He therefore proposes that Voltaire instead joins him at Cleves so that he might have the pleasure of kissing him. He sends his apologies to the marquise that he will not see her in Brussels and adds that he will be at a small place near Cleves on Sunday where he can put Voltaire at ease.