What kind of mood does Dante's line sighs that caused the everlasting air to tremble set?

Dante's line "sighs that caused the everlasting air to tremble" evokes a mood of deep sorrow and longing. The imagery suggests a profound emotional weight, as the sighs resonate in a way that affects the very atmosphere, indicating a powerful expression of grief or yearning. This creates an unsettling yet poignant ambiance, highlighting the intensity of the characters' emotions and the timeless nature of their suffering.