In the poem All'Italia, Leopardi laments the fallen at the Battle of Thermopylae (480 BC, fought between the Greeks under Leonidas and the Persians under Xerxes), and evokes the greatness of the past.
The highest expression of poetry is reached in Leopardi in L'Infinito, which is at once philosophy and art, since in the brief harmony of the verses are concentrated the conclusions of long philosophical meditations.
The canto is a sweet apostrophe to the placid nights, once dear to the serene poetess, but the words turn rapidly to a violent evocation of nature in tempest which echoes her inner turmoil.
The anguishing and accusative questions which Leopardi poses to a destiny which has denied beauty to the miserable Saffo are cut short by the thought of death.
After having wished to the man she has loved in vain that little bit of happiness which is possible to attain on this earth, Saffo concludes by affirming that of all the hopes for joy, of all the illusions, there remains to await her only Tartarus.
The first laments the fall of the great illusions ("gli ameni inganni") and the imaginary mythological worlds of the past, which embellished and enriched the fantasy of man.
He has resigned himself to the certainty of pain and of boredom to which mankind is condemned and he therefore believes it necessary to abandon the illusions and poetry in order to speculate on the laws and destiny of the universe.
After 1823, Leopardi abandoned the myths and illustrious figures of the past, which he now considered to be transformed into meaningless symbols and turned to writing about suffering in a more "cosmic" sense.
In 1823, he wrote the canto Alla sua donna ("To his woman"), in which he expresses his ardent aspiration for a feminine ideal which, with love, might render life beautiful and desirable.
During his youth, he had dreamt in vain of encountering a woman who embodied such a feminine ideal: a platonic idea, perfect, untouchable, pure, incorporeal, evanescent, and illusory.
The poem is essentially a history of the spiritual development of the poet from the day in which he came to believe that every pulse of life had died out in his soul to the moment in which the lyrical and the sentimental were reawakened in him.
With Risorgimento, lyricism is reawakened in the poet, who composes canti, generally brief, in which a small spark or a scene is expanded, extending itself into an eternal vision of existence.
This poem demonstrates why Leopardi's so-called "nihilism" does not run deep enough to touch the well-spring of his poetry: his love of man, of nature, and of beauty.
However, the accusation Leopardi makes against Nature is very strong, as being responsible for the sweet dreams of youth and for the subsequent suffering, after "the appearance of truth" (l'apparir del vero, v.60) has shattered them.
Leopardi contemplates the bounty of nature and the world which smiles at him invitingly, but the poet has become misanthropic and disconsolate with the declining of his health and youth and the deprivation of all joy.
He senses the feast which nature puts forth to him, but is unable to take part in it and foresees the remorse which will assail him in the years to come when he will regret the youthful life that he never lived.
In 1829, at Recanati, where he was constrained to return, against his wishes, because of increasing infirmity and financial difficulties, the poet wrote Le Ricordanze ("Memories"), perhaps the poem where autobiographical elements are the most evident.
Around the end of 1829 or the first months of 1830, Leopardi composed the Canto notturno di un pastore errante dell'Asia ("Night-time chant of a wandering Asian shepherd").
Throughout the entire poem, in fact, the moon remains silent, and the dialogue is transformed therefore into a long and urgent existential monologue of the sheep-herder, in desperate search of explanations to provide a sense to the pointlessness of existence.
It is precisely the absence of response on the part of the celestial orb which provokes him to continue to investigate, ever more profoundly, into the role of the moon, and therefore into that of humanity, with respect to life and the world, defining ever more sharply the "arid truth" so dear to the poetry of Leopardi.
There appears, however, in the middle of this strophe, a very important distinction: the course of human life is finite and its passage, similar to that of a "vecchierel bianco" (Petrarch, Canzoniere, XVI), terminates tragically in the "horrid abyss" of death.
In the third strophe, the sheep-herder turns again to the moon with renewed vigor and hope, believing that the orb, precisely because of this privileged extra-worldly condition, can provide him the answers to his most urgent questions: what is life?
But the moon, as the sheep-herder learns quickly, cannot provide the answers to these questions even if it knew them, since such is nature: distant, incomprehensible, mute if not indifferent to the concerns of man.
The more desolate the solitude which surrounds him, the more tightly he grasps onto love as the faith in his idealized, illusory, eternal woman ("sua donna") who placates suffering, disillusion and bitterness.
Of the two twins, Leopardi dares to invoke only death, which is no longer symbolized by the horrid Ade of Saffo, but by a young virgin who grants peace for eternity.
In the canto Sopra un bassorilievo antico sepolcrale ("On an Ancient Sepulchre Bas-relief"), a young woman has died and is represented in the act of saying goodbye to her loved ones.
Sopra il ritratto di una bella donna scolpito nel monumento sepolcrale della medesima ("On the portrait of a beautiful woman sculpted in her sepulchral monument") is basically an extension of the above.
Leopardi, after having described the nothingness of the world and of man with respect to the universe; after having lamented the precariousness of the human condition threatened by the capriciousness of nature, not as exceptional evils but as continuous and constant; and after having satirized the arrogance and the credulity of man, who propounds ideas of progress and hopes, even while knowing he is mortal, to render himself eternal, concluded with the observation that reciprocal solidarity is the only defence against the common enemy which is nature (see Operette morali, "Dialogo di Plotino e Porfirio").
In this canto, in which Leopardi expresses his vast thought about mankind, history, and nature, autobiographical elements can be found: both direct (the places described are those who surround the poet in his late years) and indirect, in the image of a man who is poor, weak, but courageous enough to be aware of his real condition.
An essential change occurs with the Ginestra, which closes the poetic career of Leopardi along with Il tramonto della Luna, which takes up the old themes of the fall of youthful illusions.