Arguably, the moral of "The Nightingale and the Rose" is that true love involves sacrifice and selflessness. Wilde makes this point through his characterization of the nightingale, the bird who gives her own life so the student can obtain a red rose.
(Btw I didn’t read the book) ..
But here’s more!! ⬇️
The main themes of the short story “The Nightingale and the Rose” by Oscar Wilde are sacrifice, love of love and materialism. The narrative can also be interpreted as a satire to Romanticism, as its end shows a painful morale: love involves risks and sacrifices and does not always triumph.
The main conflict in the story is that the girl has promised to dance with the student if he finds a red rose for her, but the student cannot find a red rose. The nightingale, trying to please the student, kills herself to color a rose red for the student.