The letter expresses profuse gratitude for a gift of nine volumes of the finest literature, received from Amsterdam from an unknown sender, urging Voltaire to identify this respectable anonymous figure.

Additionally, according to T.D.N. Besterman, Caussy misidentified the sender, incorrectly 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.