“But when the dust has drawn up the blood of a man, once he is dead, there is no return to life.”
Source: Oresteia (458 BC), Eumenides, lines 647–648 (tr. Herbert Weir Smyth)
Original
ἀνδρὸς δ᾽ ἐπειδὰν αἷμ᾽ ἀνασπάσῃ κόνις ἅπαξ θανόντος, οὔτις ἔστ᾽ ἀνάστασις.
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Aeschylus 119
ancient Athenian playwright -525–-456 BCRelated quotes

“There stood a man with his sword drawn, and his face all over with blood.”
Part II, Ch. XI : Mr. Valiant-For-Truth <!-- Sect. 4 -->
The Pilgrim's Progress (1678), Part II
Context: There stood a man with his sword drawn, and his face all over with blood. Then said Mr. Great-Heart, Who art thou? The man made answer, saying, I am one whose name is Valiant-for-truth. I am a pilgrim, and am going to the Celestial City.
“It is good that a man's enemies want him dead, for it proves he has lived a life of worth.”
Source: The Outlaw Josey Wales

“Arms observe no bounds; nor can the wrath of the sword, once drawn, be easily checked or stayed; war delights in blood.”
arma non servant modum; nec temperari facile nec reprimi potest stricti ensis ira; bella delectat cruor.
Hercules Furens (The Madness of Hercules), lines 403-405; (Lycus).
Tragedies

“The key to life is accepting challenges. Once someone stops doing this, he's dead.”