Burns's song begins with a little word that does a great deal of work: "wee." It appears in every line of the chorus, and the speaker is plainly not measuring his wife with a ruler. "Wee" in Scots is a word of affection, the sort of thing you say about what you would hate to lose. The song's subject is a husband's delight in his wife, and its central idea comes in the last stanza. Love is not only admiration; it is what makes a hard life bearable.
The chorus shows how the song works. Three lines repeat the same frame, "She is a ___ wee thing," and only the adjective changes: "winsome," "handsome," "lo'esome." Each word adds something. "Winsome" suggests charm, "handsome" suggests good looks, and "lo'esome" means lovable. The progression moves from what she is like to be near, to how she looks, to how she is loved. The fourth line, "This dear wee wife o' mine," then narrows from the general to the personal with the possessive "mine." The effect is like a man who cannot stop saying the same fond thing, which is how real affection often sounds. It also suits a song, since a chorus is something a room full of people can join in.
The first stanza turns that fondness into a claim and then an image. "I never saw a fairer, / I never lo'ed a dearer" is simple parallelism, but the rhymes (fairer, dearer, and "wear her" in the next line) are feminine, ending on an unstressed syllable, which gives the lines a soft, lilting fall. Then the stanza produces its one striking picture: "neist my heart I'll wear her." Wearing someone next to the heart suggests a locket or a brooch, and the next line confirms it by calling her "my jewel." The reason is revealing: "For fear my jewel tine," that is, in case it is lost. Underneath the cheerful tune, then, is a worry. What he values most is also what he is afraid of losing, and the short fourth line, which falls away from the longer ones, carries that small anxiety. Its final rhyme, "tine," also links forward to "mine" in the chorus, so the fear is tied to possession.
The third stanza changes the mood. After the jewellery and the compliments, the vocabulary becomes rougher: "The warld's wrack we share o't; / The warstle and the care o't." "Wrack" means ruin or wreckage, and "warstle" is a Scots form of "wrestle," a word you can hear straining. After so much softness, these sound like work. The contrast with "wee" is deliberate. The world is huge, damaged and demanding, and the wife is small and treasured, yet it is the small thing that wins. The poem does not say hardship will vanish. It says "we share o't," and sharing changes the weight. The pronoun shifts too. Earlier the stanzas are full of "I" and "my"; here it is "we," and then "Wi' her I'll blythely bear it."
The final line makes the largest claim: "And think my lot divine." The verb "think" matters. His circumstances may not be divine, but with her he can regard them that way. "Lot" means one's portion or fate, and "divine" lifts it to something almost sacred. The jewel of the earlier stanza turns out to be worth more than a jewel, because it changes how he sees everything else.
The verse form is simple on purpose. The lines are short, the rhymes arrive close together (share, care, bear in the third stanza, all echoing each other), and the "&c." after each stanza tells us the chorus returns every time. This is writing meant to be sung, and its plainness is its strength. There is no elaborate argument and no heightened courtship language; the vocabulary is domestic, and the subject is a wife rather than a distant beloved.
That is where the song's significance lies. It treats married affection as worth celebrating and shows how that affection works in practice: through small, repeated words of fondness and a willingness to carry the world's trouble together. Because it is written in Scots, the fondness also sounds unpolished and close to speech, which makes the feeling easier to believe.