Most of us would say that the person who loved us "deep and long" is the one we owe the most. Sara Teasdale's "Debt" turns that bookkeeping upside down in eight short lines. The speaker opens with a question, "What do I owe to you / Who loved me deep and long?", and answers it at once with a flat negative: "You never gave my spirit wings / Or gave my heart a song." Then comes a swerve, "But oh," and a different creditor appears, the one "I loved / Who loved me not at all." To him she owes "the little open gate / That led thru heaven's wall." The central idea is that what we owe someone depends less on how much they loved us than on what they woke in us. Love that is never returned can still be the most important gift a person receives.
The form is as compact as the argument. There are two quatrains, each rhyming only on the second and fourth lines (*long* / *song*, *all* / *wall*), which gives the poem the feel of a simple song or ballad. Each stanza runs six, six, eight and six syllables, and the rhythm is mostly iambic. The third line of each stanza stretches to four beats where the others have three: "You never gave my spirit wings," "I owe the little open gate." Those are the lines that carry the poem's key images, and the extra length reads like a slight unfurling, though that is my interpretation. The stanzas also mirror each other in syntax. "Who loved me deep and long" is answered by "Who loved me not at all," so the reader can set the two loves side by side like columns in a ledger. One column is full, the other empty, and the empty one wins.
The imagery makes the contrast sharper. What the faithful lover failed to give is airy and expansive: wings, song, flight, music. What the other gave is small and made of masonry: a gate in a wall. The speaker could have said a door flung wide or a road to the sky, but she chooses "little" and "open." The word "wall" matters too. Heaven is still fenced off, and the gate is only a gap in the fence. Nobody is said to have opened it, either. Since he "loved me not at all," the poem implies that the gift was unintended, something his indifference left ajar. The past tense of "led" suggests she has already gone through, while "owe" stays in the present, so the debt keeps running.
The money language is worth noticing. "Owe," "gave" and the title itself belong to accounts and repayment, but the poem quietly shows that this kind of debt can't be settled. The creditor never asked for anything and never knew he had lent it. The word works as a synonym for gratitude, with a faint sting in it.
The poem's tone shifts as well. The first stanza addresses "you" directly, in a cool, almost formal question. The second talks *about* "him," yet this is where the feeling breaks through, in the one exclamation, "But oh." The speaker doesn't deny the first lover's devotion. "Deep and long" is a fair acknowledgment. She simply says it left her unchanged, which is a quiet kind of cruelty. Only two lines are given to that love, and the two lines about the other are warmer and more vivid.
What makes "Debt" worth reading is how much it unsettles in so little space. It refuses the comfortable idea that love is an exchange in which being loved obliges us to love back, or that devotion earns gratitude. It suggests instead that the value of a love may lie in what it opens in the lover, whether or not it is returned. The poem also leaves a question unresolved. Is it fair to the one who loved faithfully? A reader can side with the speaker's honesty or feel sorry for the "you" who gets so little credit, and the poem seems content to let both reactions stand.