"And what a regiment it was, too," cried Ilya Petrovitch, much gratified at this agreeable banter, though still sulky.
I am gratified to hear it.
She added that Pyotr Petrovitch had particularly told her to say that, as soon as he possibly could, he would come immediately to discuss business alone with her and to consider what could be done for her, etc., etc. Sonia knew that this would comfort Katerina Ivanovna, would flatter her and gratify her pride.
There are no more uses of "gratification" in the book.