CHORUS: Who among men, though he search to the uttermost end,
can claim to have found what is meant
by god or the absence of god or of something between?
For he sees the works of the gods
turning now here and now there,
now backwards again through a fate
beyond calculation or forethought.

[ΧΟΡΟΣ: ὅ τι θεὸς ἢ μὴ θεὸς ἢ τὸ μέσον,
τίς φησ᾽ ἐρευνήσας βροτῶν
μακρότατον πέρας εὑρεῖν
ὃς τὰ θεῶν ἐσορᾷ
δεῦρο καὶ αὖθις ἐκεῖσε
καὶ πάλιν ἀντιλόγοις
πηδῶντ᾽ ἀνελπίστοις τύχαις;]

Euripides (485?-406? BC) Greek tragic dramatist
Helen [Ἑλένη], l. 1137ff, Stasimon 1, Strophe 2 (412 BC) [tr. Warner (1951)]
    (Source)

On Hera fooling Menelaus with an illusion of Helen.(Source (Greek)). Other translations:

Was this then human, or divine?
Did it a middle nature share?
What mortal shall declare?
Who shall the secret bounds define?
When the gods work, we see their pow'r;
We see on their high bidding wait
The prosp'rous gales, the storms of fate:
But who their awefull cousils shall explore?
[tr. Potter (1783)]

Whether the image was divine,
Drew from terrestrial particles its birth,
Or from the middle region, how define
By curious search, ye sons of earth?
Far from unravelling Heaven's abstruse intents,
We view the world tost to and fro,
Mark strange vicissitudes of joy and woe,
Discordant and miraculous events.
[tr. Wodhull (1809)]

Whether it was a God, or not a God, or something between, who of mortals can aver, having searched out to the very end, so as to discover, who [indeed] perceives the counsels of the Gods flitting hither and thither in unexpected, contradictory turns of fate?
[tr. Buckley (1850)]

What is god, or what is not god, or what is in between -- what mortal says he has found it by searching the farthest limit, when he sees divine affairs leaping here and there again and back, in contradictory and unexpected chances?
[tr. Coleridge (1891)]

What mortal claims, by searching to the utmost limit, to have found out the nature of God, or of his opposite, or of that which comes between, seeing as he doth this world of man tossed to and fro by waves of contradiction and strange vicissitudes?
[tr. Coleridge, common variant]

Who among men dare say that he, exploring
Even to Creation's farthest limit-line,
Ever hath found the God of our adoring,
That which is not God, or the half-divine --
Who, that beholdeth the decrees of Heaven
This way and that in hopeless turmoil swayed?
[tr. Way (Loeb) (1912)]

Who hath knowledge? Who so wise,
Can tell us what divinities
What spirits of a mingled birth,
Part of heaven and part of earth,
Shape our mortal destinies,
Weaving in the web of chance
Circumstance with circumstance?
Nay, the riddle baffles common wit:
Mortal reason may not compass it.
[tr. Sheppard (1925)]

You who with learned patience plod
Remotest realms of toilsome thought,
Can you by searching find out God,
Or bound his nature? Look at man!
From want to wealth, now forth, now back,
Now tossed from fame to infamy
By unforeseen, ambiguous chance!
[tr. Vellacott (1954), Antistrophe 2]

What is god, what is not god, what is between man
and god, who shall say? Say he has found
the remote way to the absolute
that he has seen god, and come
back to us, and returned there, and come
back again, reason's feet leaping
the void? Who can hope for such fortune?
[tr. Lattimore (1956)]

As for what is god, or not god, or something in between, what mortal having searched can say? The distant end of this enquiry has been found by the man who sees the gods’ fortunes leaping this way and that, and back again in twists of circumstance, contradictory and unforeseen.
[tr. Davie (2002)]

Can any man
After profound research
Say he has the answers to these questions:
What is a god?
What is not a god?
Can there be something in between?
Is knowledge of the gods possible
When you see how gods behave -- their actions
Unstable
Undisciplined
Unpredictable
Randomly jumping now this way
Now that?
[tr. A. Wilson (2007)]

What mortal can possibly claim what is god, what isn’t, what’s in between?
The most a mortal can do is to understand that whatever the gods deliver will turn this way one minute, the other a minute later, only to turn back this way again, with unfathomable consequences.
[tr. Theodoridis (2011)]

What is god or not god, and what lies in between,
What mortal could discover this?
The furthest limit of certainty one has found when she sees
matters divine leaping here and there, back again, chances contradictory, unexpected.
[tr. Ambrose et al. (2018)]

What is god, or what is not god, or what is in between -- what mortal says he has found it by searching the farthest limit, when he sees divine affairs leaping here and there again and back, in contradictory and unexpected chances?
[tr. Coleridge / Helen Heroization Team]