Idiot, not to know
his days are numbered who would fight the gods!
His children will not sing around his knees
“Papa! Papa!” on his return from war.

Ὅττι μάλ’ οὐ δηναιὸς ὃς ἀθανάτοισι μάχηται,
οὐδέ τί μιν παῖδες ποτὶ γούνασι παππάζουσιν
ἐκ πολέμοιο καὶ αἰνῆς δηϊοτῆτος.

Homer (fl. 7th-8th C. BC) Greek author
The Iliad, Book 5, ll. 407-409 (c. 750 BC) [tr. Fitzgerald (1974)]
    (Source)

Alt. trans.:

Not knowing he that fights with Heav’n hath never long to live,
And for this deed, he never shall have child about his knee
To call him father, coming home.
[tr. Chapman (1611), ll. 387-89]

No man who fights with gods will live long or hear his children prattling about his knees when he returns from battle.
[tr. Butler (1898)]

Know thou, whoe'er with heavenly power contends,
Short is his date, and soon his glory ends;
From fields of death when late he shall retire,
No infant on his knees shall call him sire.
[tr. Pope (1715-20)]

Infatuate! he forgets
That whoso turns against the Gods his arm
Lives never long; he never, safe escaped
From furious fight, the lisp’d caresses hears
Of his own infants prattling at his knees.
[tr. Cowper (1791), ll. 474-78]

Infatuate! nor does the son of Tydeus know this in his mind, that he is by no means long-lived who fights with the immortals, nor ever at his knees will sons lisp a father’s name, as he returns from war and dreadful battle.
[tr. Buckley (1860)]

Unknowing he how short his term of life
Who fights against the Gods! for him no child
Upon his knee shall lisp a father's name,
Safe from the war and battle-field return'd.
[tr. Derby (1864), ll. 463-466]

Verily he endureth not for long who fighteth with the immortals, nor do his children prattle about his knees when he is come back from war and the dread conflict.
[tr. Murray (1924)]

That man who fights the immortals lives for no long time, his children do not gather to his knees to welcome their father when he returns home after the fighting and the bitter warfare.
[tr. Lattimore (1951)]

Doesn't the son of Tydeus know, down deep,
the man who fights the gods does not live long?
Nor do his children ride his knees with cries of 'Father' --
home at last from the wars and heat of battle.
[tr. Fagles (1990), ll. 465-468]