Wandering through your own memories feels harmless, even lovely. Dickinson insists it is a kind of binge, and a more dangerous one than anything sold in a tavern. The poem's central idea is that nostalgia is an intoxication no one regulates. It is pleasant while it lasts, impossible to police from outside, and quietly corrosive to the sturdier parts of life.
The drinking metaphor arrives through a paradox. "Sauntering alone" sounds leisurely and innocent, yet it is called "a divine intemperance," a phrase that pairs heavenly pleasure with excess. "A prudent man would shun" it, which leaves the speaker, by implication, imprudent and unrepentant. The second quatrain turns to the law. Bought liquor is easy to avoid, but "statutes do not meddle / With the internal bar." The word "bar" works twice. It is the counter where drinks are served, and it is also the bar of a courtroom, where judgments are made. The inner life, the poem suggests, has both its tavern and its tribunal, and no outside authority can enter either.
Then the poem darkens and grows more abstract. Calling a sunset "Pernicious" is startling, since sunsets are usually offered as pure beauty. Dickinson's complaint is that it is "Permitting to pursue / But impotent to gather." You may chase the light, but you cannot take hold of it. The p-sounds of "Pernicious," "Permitting" and "pursue" almost sound like the chase itself. Memory, she implies, behaves the same way, giving the longing mind endless pursuit and no possession.
The sentence that follows holds back its subject, "The tranquil perfidy," until the twelfth line. The reader is led through the sunset, the pursuing and the failing to gather before learning what actually does the damage. The phrase is an oxymoron. Perfidy means treachery, and here it is calm and soft-spoken, a betrayal that never raises its voice. Its effect is to "Alloy" our "firmer moments." In metalwork, an alloy mixes one metal with another, and the verb hints at dilution or contamination. The sunset's gold has turned into "that severest gold," a precious but austere substance that is "Convenient to the longing / But otherwise withheld." It is available only when we ache for it, and even then only as an image.
The form supports this. The lines run between five and eight syllables, in the compact, hymn-like manner we associate with Dickinson, but the rhymes never quite close. "Alone" and "shun" share only a final consonant, "beware" and "bar" only a blur of vowel and r, and "gold" and "withheld" come closest but still do not match. The sounds keep almost meeting, which is exactly the experience the poem describes. Her diction does similar work. Soft, slow words like "sauntering" and "tranquil" sit beside hard, Latinate ones like "pernicious," "impotent" and "perfidy," so that the pleasant surface and the harm underneath share the same sentences.
Dickinson, who lived from 1830 to 1886 in Amherst, Massachusetts, was a poet of compression, and this piece shows why that matters. In sixteen lines she borrows the vocabulary of drink, law, commerce and metallurgy to describe something that happens entirely inside a person. She also declines to take a simple moral line. Memory is "divine," and it is also "pernicious." The speaker neither condemns the habit nor promises to give it up, and this honesty about being drawn to what weakens us is what keeps the poem unsettling. Nostalgia is usually treated as sweet and harmless, and here it becomes a private vice with a real cost.