Sylvia Plath's quote reflects a longing for a powerful and vibrant existence, symbolized by the "thunderbird." The mention of the seasonal return of these creatures suggests a desire for renewal and revival, contrasting with feelings of loss or disappointment in life. The thunderbird, known for its strength and energy, embodies qualities that Plath yearned for, indicating a wish for more intense experiences and emotions.
By emphasizing the cyclical nature of spring, Plath highlights the beauty of new beginnings and transformations. The roar of the thunderbird signifies not just life returning, but a loud, passionate affirmation of existence that she finds lacking. Overall, the quote captures a deeper yearning for vitality and connection in an often dull reality.