Make my best excuses [polite, rather than sincere] to Madame the MARQUISE, that I cannot have the satisfaction of seeing her at Brussels.

All that are about me know the intention I was in; which certainly nothing but the fever could have made me change.
"Sunday next I shall be at a little Place near Cleve,"-- Schloss of Moyland, which, and the route to which, this Courier can tell you of;--"where I shall be able to possess you at my ease.

If the sight of you don't cure me, I will send for a Confessor at once.

Adieu; you know my sentiments and my heart.

[Preuss, _OEuvres de Frederic,_ xxii.