In this letter Frederick wishes that the "hot fever" of Europe would recover soon. He tells Voltaire that he himself is no longer sick in bosy or mind. The end of the letter turns political as Frederick addresses the Austrians directly, telling them that their ambition and their desire to dominate everything actually created more enemies for them, and that there will always be defenders of German and European liberties. This is probably a reference to the Seven Years War, which was fought from 1754-1763. The letter is signed with a large and elegant letter "F".