He means to fling it all down, since he has quite as much credit with the Pope as you have.

You throw oceans of money away and work by night, so that nobody may see what you are doing.

You follow in the footsteps of a Spaniard, having no knowledge of your own about the art of building, and he less than nothing.

Nanni stays there in your despite: you did everything to get him removed; but the Pope keeps him, being convinced that nothing good can be done without him." After this Ughi goes on to relate how Michelangelo's enemies are spreading all kinds of reports against his honour and good fame, criticising the cornice of the Palazzo Farnese, and hoping that its weight will drag the walls down.

At the end he adds, that although he knows one ought not to write about such matters, yet the man's "insolence and blackguardly shamelessness of speech" compel him to put his friend on his guard against such calumnies.
After the receipt of this letter, Michelangelo sent it to one of the Superintendents of the Fabric, on whose sympathy he could reckon, with the following indorsement in his own handwriting: "Messer Bartolommeo (Ferrantino), please read this letter, and take thought who the two rascals are who, lying thus about what I did at the Palazzo Farnese, are now lying in the matter of the information they are laying before the deputies of S.Peter's.