“The fountains mingle with the river and the rivers with the ocean”
Context: The speaker opens by citing how elements of nature join together.
Analysis
Shelley uses imagery of water "mingling" to argue that union is a natural, universal law that his beloved should follow. The verb "mingle" carries sensual connotations of physical closeness. This builds a persuasive, almost logical case for love and intimacy.
Language Techniques:
Exam Tip
Use for love as natural and persuasive. Compare the confident desire here with the longing in Sonnet 29.