Shame is not of his soul; nor understood,
The greatest evil and the greatest good.

[οὐδέ οἱ αἰδὼς
γίγνεται, ἥ τ᾽ ἄνδρας μέγα σίνεται ἠδ᾽ ὀνίνησι.]

Homer (fl. 7th-8th C. BC) Greek author

The Iliad [Ἰλιάς], Book 24, l. 44ff (24.44) [Apollo] (c. 750 BC) [tr. Pope (1715-20)]
    (Source)

Speaking of Achilles' mistreatment of Hector's corpse. Pope footnotes: "This is obscure. The original is, 'He has no shame, shame which harms men much, and profits them much.' Dr. Leat, following an ancient critic, thinks the passage an interpolation."

Alternate translations:

And shame, a quality
Of so much weight, that both it helps and hurts excessively
Men in their manners, is not known, nor hath the pow’r to be,
In this man’s being.
[tr. Chapman (1611), l. 47ff]

Shame, man’s blessing or his curse.
[tr. Cowper (1791), l. 58]

Cowper footnotes: "His blessing, if he is properly influenced by it; his curse in its consequences if he is deaf to its dictates."

Nor in him is there sense of shame, which greatly hurts and profits men.
[tr. Buckley (1860)]

Conscience, arbiter of good and ill.
[tr. Derby (1864)]

Neither hath he shame, that doth both harm and profit men greatly.
[tr. Leaf/Lang/Myers (1891)]

That conscience which at once so greatly banes yet greatly boons him that will heed it.
[tr. Butler (1898)]

Neither is shame in his heart, the which harmeth men greatly and profiteth them withal.
[tr. Murray (1924)]

There is not in him any shame; which does much harm to men but profits them also.
[tr. Lattimore (1951)]

He has no shame -- that gift that hinders mortals but helps them, too.
[tr. Fitzgerald (1974)]

No shame in the man,
shame that does great harm or drives men on to good.
[tr. Fagles (1990), l. 52ff]

Shame and respect no
longer he has, which harm men greatly but profit them also.
[tr. Merrill (2007)]