"My love she speaks like silence,
Without ideals or violence,
She doesn't have to say she's faithful,
Yet she's true, like ice, like fire.
People carry roses,
Make promises by the hours,
My love she laughs like the flowers,
Valentines can't buy her."

That is beautiful poetry that goes with a beautiful melody. The totality of the song would NOT be what it is without the melody Dylan put to it or wrote the words with. I think both lyric and melody came at 'the same time'. I can also think of fifty melodies that would ruin that great piece of writing.