It was illumined by the light of sudden understanding.

"I have it," he cried.

"The answer is plain.

You did not assist the Lord Giovanni to write them.

Why?
Because you wrote them yourself, and you gave them to him that he might pass them off as his own." It was a merciful thing for me that the whole company fell into a burst of laughter and applauded Filippo's quick discernment, which they never doubted.