the nightingale and the rose的象征意

Symbolic meanings of “Red rose”, “Lizard” and “Nightingale”:
Red rose --- true love, which needs constant nourishment of passions of the lovers. It can be divided into three stages: love in the heart of a boy and a girl; love in the soul of a man and a maid; and love that is perfected by Death, that does not die in the tomb.
Lizard --- cynic, a person who sees little or no good in anything and who has no belief in human progress; person who shows this by sneering and being contemptuous (cynical people)
Nightingale --- a truthful, devoted pursuer of love, who dares to sacrifice his own precious life

Wilde’s comments in a letter to one of his friends(May 1888):
The nightingale is the true lover, if there is one.?She, at least, is Romance, and the student and the girl are, like most of us, unworthy of Romance. Nightingale sacrifices its own life for pure love’s sake. A true love needs wholehearted devotion and passion.