Final answer:
The metaphorical mother in literature typically symbolizes nurturing and protective qualities, strength in the face of adversity, or cultural values associated with motherhood.
Step-by-step explanation:
The metaphorical mother referred to in the line "Or first... its breast." symbolizes various elements depending on the context of the poem and the lens through which we view the metaphor.
Given the multiple excerpts and their varied contexts, there isn't a one-size-fits-all answer to the symbolism of the metaphorical mother. However, in general, it can represent the nurturing and protective qualities of nature, the resilience and strength in the face of adversity, or a societal commentary on values associated with motherhood.