Most love poems try to say something new. Sonnet 21 does the opposite. It begs to hear the same three words again and again, then argues that the begging is perfectly reasonable. The speaker has apparently been teased: her beloved has treated the repeated "I love you" as "a cuckoo-song," the two-note call that goes on and on. She takes the insult and turns it around. Spring, she says, never arrives "without her cuckoo-strain." The season is only "in all her green completed" once that monotonous call is heard. The central idea is that repetition is not staleness but renewal. A phrase said a hundred times can still be fresh, just as every spring is.
The poem makes this case partly through its sound. The first line, "Say over again, and yet once over again," stumbles over itself, piling up "again" and "over" and doing exactly what it asks. The form is a Petrarchan sonnet, with an octave rhyming *abba abba*. Its rhymes are *again / plain / strain / pain* on one side and the softer, two-syllable *repeated / treat it / completed / greeted* on the other. The turn doesn't wait politely for line nine. It comes at line seven with the word "Beloved," where the argument gives way to confession. Sentences spill across line endings ("greeted / By a doubtful spirit-voice"), as though feeling were pushing against the tidy rhyme scheme.
That confession changes how we read the opening. The speaker is "amid the darkness," hearing a "doubtful spirit-voice," and her demand grows out of "that doubt's pain." What looked like playful insistence is closer to need. She isn't asking for novelty. She wants reassurance she can trust.
The sestet answers doubt with a pair of questions. "Who can fear / Too many stars, though each in heaven shall roll, / Too many flowers, though each shall crown the year?" The repeated word "each" is the key. Stars and flowers are numberless, but none is a copy of another, and the same can be true of declarations of love. The images also stretch across space (the heavens) and time (the year), so the plea feels as large as the sky and the seasons. The sestet's alternating rhymes (*fear / year / Dear*, then *roll / toll / soul*) chime back and forth like the repetition the speaker is defending.
Line twelve is the high point of that chiming: "Say thou dost love me, love me, love me—toll." The words fall into a steady beat, so the line itself seems to ring. "Toll" turns the phrase into bell strokes, and "The silver iterance!" gives the repetition a clear, bright sound. "Iterance" is a rare word for repetition, and using it makes the thing she is defending sound precious rather than tiresome.
Then the poem turns again, more quietly. After all that noise she adds a condition: "only minding, Dear, / To love me also in silence with thy soul." The small word "also" matters. She does not want silence instead of words, but as well as them. Words are the audible sign, and the soul's silent love is what they must be backed by. The rhyme of "toll" with "soul" holds the two together, the loudest word in the poem sounding against the final, quietest one.
The poem matters for how much it does in fourteen lines. The sonnet has long been associated with a speaker praising someone at a distance. Here the speaker asks, openly and a little anxiously, to be answered. She gets the better of the teasing along the way, with an argument drawn from spring, stars and flowers. The number in the title shows this is one poem in a longer sequence, but it stands well alone. Anyone who has wanted to hear "I love you" one more time, and wondered whether that was foolish, will recognise the argument. The poem's answer is that it isn't foolish, as long as the words are meant.