Not one drop of blood
is left inside my veins that does not throb:
I recognize signs of the ancient flame.

[Men che dramma
di sangue m’è rimaso, che non tremi;
conosco i segni de l’antica fiamma.]

Dante Alighieri (1265-1321) Italian poet

The Divine Comedy [Divina Commedia], Book 2 “Purgatorio,” Canto 30, l. 46ff (3.46-68) (1314) [tr. Musa (1981)]
    (Source)

Dante, on seeing his long-lost love, Beatrice, repeating to Virgil the lines he had given Dido (Aeneid, 4.23) about how she felt the stirring of long-dead passion upon seeing Aeneas: "Agnosco veteris vestigia flammae" ("I know the traces of the ancient flame" [tr. Kline (2002)]).

(Source (Italian)). Alternate translations:

There is no dram of blood,
That doth not quiver in me. The old flame
Throws out clear tokens of reviving fire.
[tr. Cary (1814)]

There is not one drop
Of blood within me trembling but became:
I know the tokens of the ancient fame.
[tr. Bannerman (1850)]

Not a drachm
Of blood remains in me, that does not tremble;
I know the traces of the ancient flame.
[tr. Longfellow (1867)]

Less than a dram of blood remains to me which trembles not; I recognise the signs of the ancient flame.
[tr. Butler (1885)]

Rests within my frame
No dram of blood that does not tremble now;
I know the symptoms of the olden flame.
[tr. Minchin (1885)]

Less than a drachm of blood remains in me that doth not tremble; I recognize the signals of the ancient flame.
[tr. Norton (1892)]

Less than a drachm of blood
is left in me that trembleth not; I recognise
the tokens of the ancient flame.
[tr. Okey (1901)]

Not a drop of blood is left in me that does not tremble; I know the marks of the ancient flame.
[tr. Sinclair (1939)]

Scarce one drop remains
Of blood in me that trembles not: by this
I recognize the old flame within my veins.
[tr. Binyon (1943)]

There is scarce a dram
That does not hammer and throb in all my blood;
I know the embers of the ancient flame.
[tr. Sayers (1955)]

There is not within me
one drop of blood unstirred. I recognize
the tokens of the ancient flame.
[tr. Ciardi (1961)]

Less than a drop of blood
Is left in me, that is not trembling:
I know the signs of the ancient flame.
[tr. Sisson (1981)]

I am left with less
than one drop of blood that does not tremble:
I recognize the signs of the old flame.
[tr. Mandelbaum (1982)]

There is a barely a drop of blood in me that does not tremble: I know the tokens of the ancient flame.
[tr. Kline (2002)]

Less than a dram of blood is left me that is not trembling: I recognize the signs of the ancient flame!
[tr. Durling (2003)]

There is not one gram
of blood in me that does not tremble now.
I recognize the signs of ancient flame.
[tr. Kirkpatrick (2007)]

Not a single drop of blood
remains in me that does not tremble --
I know the signs of the ancient flame.[tr. Hollander/Hollander (2007)]

There isn't a single drop of whatever blood
Still flows in my veins that isn't shaking from fear:
I recognize the signs of that ancient fire.
[tr. Raffel (2010)]