W. B. Yeats’s “A Song” sets out a quietly devastating discovery: physical training can keep the body young, desire can remain, yet the heart—the seat of passion and intensity—ages on its own terms. The speaker begins with a confident, even practical assumption. He thought youth could be prolonged by “dumb-bell and foil,” by weight and fencing sword, as if bodily vigor were the only measure of youth. Those objects are precise: one suggests repeated resistance, the other speed and skill. Together they imply discipline, control, a body deliberately maintained. But the stanza closes with a shift into wonder and dismay: “Oh, who could have foretold / That the heart grows old?”
The second stanza moves from the gymnasium to the lover’s side. The speaker still has “many words,” still commands language, but language no longer produces the involuntary physical response of love. He is “no longer faint / Because at her side.” The word “faint” matters because it locates passion in the body—a swoon, a sudden weakness, a loss of control—rather than in eloquence or argument. Words remain; the body’s answering tremor has gone. The phrase “What woman’s satisfied” hovers between two implications: no woman can be satisfied by words alone, and the speaker can no longer satisfy the expectation that love should make him tremble. The refrain returns, and with it the poem insists that this is not a single failed romance but a permanent change in the self.
The third stanza sharpens the paradox. “I have not lost desire,” the speaker says, but desire now exists without the heart that once gave it heat. The most startling image follows: he thought his heart “’twould burn my body / Laid on the death-bed.” The expected relationship between body and passion is reversed. Usually the body weakens while feeling persists; here the speaker imagined his heart so fierce that it would still be on fire even as the body died beneath it. Instead, the heart proves mortal before the body does. The contraction “’twould” gives the line a spoken, intimate quality, as if the speaker is confessing a private miscalculation rather than delivering a poetic statement.
The poem’s form has the brevity and refrain of a song, but its music is muted and uncertain. Each stanza is built from short, irregular lines that hover around two or three stresses, creating a halting, reflective movement rather than a flowing lyric line. The one full rhyme arrives at the end of each stanza, in the couplet “foretold / old,” so the ear keeps returning to the same place of surprise. The first two stanzas ask “Oh, who could have foretold”; the final stanza replaces “Oh” with “But,” a small grammatical shift that turns wonder into resignation.
What makes the poem significant is its refusal to treat aging as one process. Yeats separates bodily fitness, verbal skill, desire, and the heart, and shows them moving at different speeds. The speaker can keep his body strong and still command words, but neither saves him from the quieter loss: the cooling of the inner fire that once seemed as if it would outlast the body. The poem offers no consolation and no moral. It simply names the discovery in a repeated, wondering couplet, letting its shock deepen with each short stanza.