ORESTES: Ye Gods! There’s no art to tell a decent man,
since generations work haphazardly.
I’ve encountered worthless men, the sons
of noble fathers; good men born from bad;
and I’ve seen hunger in a rich man’s mind,
a poor man’s body housing thoughts sublime.

[ὈΡΈΣΤΗΣ: φεῦ:
οὐκ ἔστ᾽ ἀκριβὲς οὐδὲν εἰς εὐανδρίαν:
ἔχουσι γὰρ ταραγμὸν αἱ φύσεις βροτῶν.
ἤδη γὰρ εἶδον ἄνδρα γενναίου πατρὸς
τὸ μηδὲν ὄντα, χρηστά τ᾿ ἐκ κακῶν τέκνα,
λιμόν τ᾿ ἐν ἀνδρὸς πλουσίου φρονήματι,
γνώμην δὲ μεγάλην ἐν πένητι σώματι.]

Euripides (485?-406? BC) Greek tragic dramatist

Electra [Ἠλέκτρα], l. 367ff (c. 420 BC) [tr. Wilson (2016)]
    (Source)

(Source (Greek)). Alternate translations:

There is no certain mark of generous souls:
For in the tempers of mankind prevails
A strange confusion. I have seen the son
Of a great father dwindle into nothing.
And virtuous children spring from wicked Sires;
Among the rich a mean contracted spirit
Have I discover'd, and the poor man's breast
Withi most exalted sentiments inspir'd.
[tr. Wodhull (1809)]

Ah! there is no sure mark to recognize a man's worth; for human nature hath in it an element of confusion. For I have seen ere now the son of a noble sire prove himself a worthless knave, and virtuous children sprung from evil parents; likewise dearth in a rich man's spirit, and in a poor man's frame a mighty soul.
[tr. Coleridge (1891)]

Alas! there is no sure mark of manliness; for the natures of mortals exhibit a confusion. For already have I seen a man who was naught sprung from a noble sire, and good children [sprung] from bad [fathers[,. and hunger in the spirit of a rich man, and a great mind in a poor body.
[tr. Buckley (1892)]

Lo, there is no sure test for manhood’s worth:
For mortal natures are confusion-fraught. --
I have seen ere now a noble father’s son
Proved nothing-worth, seen good sons of ill sires,
Starved leanness in a rich man’s very soul,
And in a poor man’s body a great heart.
[tr. Way (1896)]

How dark lies honour hid! And what turmoil
In all things human: sons of mighty men
Fallen to naught, and from ill seed again
Good fruit: yea, famine in the rich man's scroll
Writ deep, and in poor flesh a lordly soul.
[tr. Murray (1905)]

Ah! There is no exact way to test a man's worth; for human nature has confusion in it. I have seen before now the son of a noble father worth nothing, and good children from evil parents; famine in a rich man's spirit, and a mighty soul in a poor man's body.
[tr. Coleridge (1938 ed.)]

It is impossible to judge a man’s virtue with accuracy. There’s always great confusion in the nature of mortals. I, myself, have seen worthless children born of a virtuous man and from evil parents born brilliant children. I have seen a small, poor mind in a wealthy man and in the soul of a poor man, a great one.
[tr. Theodoridis (2006)]

Well, nothing is precise
when it comes to how a man is valued --
men’s natures are confusing. Before this,
I’ve seen a man worth nothing, yet he had
a noble father; I’ve known evil parents
with outstanding children, seen famine
in a rich man’s mind and a great spirit
in a poor man’s body.
[tr. Johnston (2009)]

I have known a man of a noble father who turns out
To be nothing while powerful men can rise from the low.
I have seen emptiness in a rich man’s thought
And great judgement in a poor person’s frame.
[tr. @sententiq (2020)]