But the Queen, long sick with love,
Nurses her heart’s deep wound
With her pounding blood, and dark flames
Lick at her soul. Thoughts of Aeneas —
The man’s heroic lineage, his noble character —
Flood her mind, his face and words transfix
Her heart, and her desire gives her no rest.

[At regina gravi iamdudum saucia cura
volnus alit venis, et caeco carpitur igni.
Multa viri virtus animo, multusque recursat
gentis honos: haerent infixi pectore voltus
verbaque, nec placidam membris dat cura quietem.]

Virgil (70-19 BC) Roman poet [b. Publius Vergilius Maro; also Vergil]
The Aeneid [Ænē̆is], Book 4, l. 1ff (4.1-5) (29-19 BC) [tr. Lombardo (2005)]
    (Source)

(Source (Latin)). Alternate translations:

But anxious cares already seiz'd the queen:
She fed within her veins a flame unseen.
The hero's valor, acts, and birth inspire
Her soul with love, and fan the secret fire.
His words, his looks, imprinted in her heart,
Improve the passion, and increase the smart.
[tr. Dryden (1697)]

But the the queen, long since pierced with painful care, feeds the wound in her veins, and is consumed by unseen flames. The many virtues of the hero, the many honors of his race, recur to her thoughts: hjis looks and words dwell fixed in her soul: nor does care allow calm rest to her limbs.
[tr. Davidson/Buckley (1854)]

Not so the queen: a deep wound drains
The healthful current of her veins:
Long since the unsuspected flame
Has fastened on her fevered frame:
Much dwells she on the chief divine,
Much on the glories of his line:
Each look is pictured in her breast,
Each word: nor passion lets her rest.
[tr. Conington (1866)]

But pierced with grievous pangs long since, the queen
Feeds in her veins the wound, by secret fire
Consumed. The hero's many virtues oft
Recur to her mind, and glories of his race.
Within her heart his looks, his words are fixed;
Her troubled soul allows her limbs no rest.
[tr. Cranch (1872)]

But the Queen, long ere now pierced with sore distress, feeds the wound with her life-blood, and catches the fire unseen. Again and again his own valiance and his line's renown flood back upon her spirit; look and accent cling fast in her bosom, and the pain allows not rest or calm to her limbs.
[tr. Mackail (1885)]

Meanwhile the Queen, long smitten sore with sting of all desire,
With very heart's blood feeds the wound and wastes with hidden fire.
And still there runneth in her mind the hero's valiancy,
And glorious stock; his words, his face, fast in her heart they lie:
Nor may she give her body peace amid that restless pain.
[tr. Morris (1900)]

Long since a prey to passion's torturing pains,
The Queen was wasting with the secret flame,
The cruel wound was feeding on her veins.
Back to the fancy of the lovelorn dame
Came the chief's valour and his country's fame.
His looks, his words still lingered in her breast,
Deep-fixt.
[tr. Taylor (1907), st. 1]

Now felt the Queen the sharp, slow-gathering pangs
of love; and out of every pulsing vein
nourished the wound and fed its viewless fire.
Her hero's virtues and his lordly line
keep calling to her soul; his words, his glance,
cling to her heart like lingering, barbed steel,
and rest and peace from her vexed body fly.
[tr. Williams (1910)]

But the queen, long since smitten with a grievous love-pang, feeds the wound with her life-blood, and is wasted with fire unseen. Oft to her heart rushes back the chief's valour, oft his glorious stock; his looks and words cling fast within her bosom, and the pang withholds calm rest from her limbs.
[tr. Fairclough (1916)]

But the queen finds no rest. Deep in her veins
The wound is fed; she burns with hidden fire.
His manhood, and the glory of his race
Are an obsession with her, like his voice,
Gesture and countenance.
[tr. Humphries (1951)]

But now for some while the queen had been growing more grievously love-sick,
Feeding the wound with her life-blood, the fire biting within her.
Much did she mue on the hero's nobility and much
On his family's fame. His look, his words had gone to her heart
And lodged there: she could get no peace from love's disquiet.
[tr. Day Lewis (1952)]

Too late. The queen is caught between love's pain
and press. She feeds the wound within her veins;
she is eaten by a secret flame. Aeneas'
high name, all he has done, again, again
come like a flood. His face, his words hold fast
her breath. Care strips her limbs of calm and rest.
[tr. Mandelbaum (1971)]

The queen, for her part, all that evening ached
With longing that her heart's blood fed, a wound
Or inward fire eating her away.
The manhood of the man, his pride of birth,
Came home to her time and again; his looks,
His words remained with her to haunt her mind,
And desire for him gave her no rest.
[tr. Fitzgerald (1981)]

But the queen had long since been suffering from love's deadly wound, feeding it with her blood and being consumed by its hidden fire. Again and again there rushed into her mind thoughts of the great valour of the man and the high glories of his line. His features and the words he had spoken had pierced her heart and love gave her body no peace or rest.
[tr. West (1990)]

But the queen -- too long she has suffered the pain of love,
hour by hour nursing the wound with her lifeblood,
consumed by the fire buried in her heart.
The man’s courage, the sheer pride of his line,
they all come pressing home to her, over and over.
His looks, his words, they pierce her heart and cling --
no peace, no rest for her body, love will give her none.
[tr. Fagles (2006)]

But love's pain had already pierced the queen.
She fed it with her life-blood; the hidden flame consumed her.
Aeneas' courage and his noble birth haunted her thoughts.
His face and words lodged in her heart.
Love let her find no rest in sleep.
[tr. Bartsch (2021)]