The mania afflicting most French people is the desire to be witty, and the mania afflicting those who want to be witty is the desire to write books.
However, this is a very bad idea.
 
[La fureur de la plupart des François, c’est d’avoir de l’esprit ; et la fureur de ceux qui veulent avoir de l’esprit, c’est de faire des livres.
Cependant il n’y a rien de si mal imaginé.]

Charles-Lewis de Secondat, Baron de Montesquieu (1689-1755) French political philosopher

Persian Letters [Lettres Persanes], Letter 66, Rica to *** (1721) [tr. MacKenzie (2014), No. 64]
    (Source)

(Source (French)). Alternate translations:

The Predominant Passion or rather Fury of most of the French is, to be thought Wits; and the Predominant passion of those who would be thought Wits, is to write Books.
And yet there is nothing so ill-contrived.
[tr. Ozell (1736 ed.), No. 64]

The passion of most of the French is to be taken for wits, and the passion of thole who would be thought wits, is to write books. And yet there is nothing so badly imagined.
[tr. Floyd (1762)]

The passion of nearly every Frenchman, is to pass for a wit; and the passion of those who wish to be thought wits, is to write books.
There never was such an erroneous idea.
[tr. Davidson (1891)]

The passion of most Frenchmen is to be thought wits ; and the passion of those who wish to be thought wits is to write books.
It is impossible to imagine a more unfortunate mania.
[tr. Betts (1897)]

The passion of most of the French is to be thought witty, and the passion of those who wish to be considered wits is to write books.
A worse misconception cannot be imagined.
[tr. Healy (1964)]

Most Frenchmen are desperately eager to be thought witty and, of those who seek to be witty, most are desperately eager to write a book.
No plan, however, could be less well conceived.
[tr. Mauldon (2008), No. 64]