Take from the dresser of deal,
Lacking the three glass knobs,
An ordinary, rather battered dresser. “Deal” is pine, which is soft wood used to create low-quality furniture and cheap coffins. The pine dresser is thus reminiscent of a poor person’s coffin. The missing knobs suggest a general state of poverty and disrepair in the house.
Inasmuch as the poem is denying the existence of a divine being, the missing glass knobs may represent the three Persons of the Trinity (Father, Son, and Holy Spirit)—or more specifically, their absence.
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