She would have been too happy but for poor Harriet; but every blessing of her own seemed to involve and advance the sufferings of her friend, who must now be even excluded from Hartfield.
– Jane Austen
Emma, Chapter 51. Emma is blissfully in love with Mr. Knightley and the prospect of marrying him. But the one thing threatening to puncture her bubble of happiness is her concern for Harriet. Emma feels guilty because her friend has confessed to being in love with Mr. Knightley.