Such is the life of man, nor wholly blest,
Nor wholly wretched; on her votaries Fortune
now smiles, then frowns. Since our prosperity
Is thus unstable, is not an exemption
From grief the greatest pleasure life can yield?

[τοιόσδε ϑνητῶν τῶν ταλαιπώρων βίος’
οὔτ᾽ εὐτυχεῖ τὸ πάμπαν οὔτε δυστυχεῖ,
εὐδαιμονεῖ δὲ καύϑις οὐκ εὐδαιμονεῖ.
τί δῆτ᾽ ἐν ὄλβω μὴ σαφεῖ βεβηκότες
οὐ ξῶμεν ὡς ἥδιστα μὴ λυπούμενοι;]

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

Antiope [Αντιοπη], frag. 196 (TGF, Kannicht) (c. 410 BC) (Amphion?) [tr. Wodhall (1809)]
    (Source)

(Source (Greek)). Alternate translation:

Such is the life of wretched mortals;
a man is neither wholly fortunate nor unfortunate;
why then, on entering prosperity which may be insecure,
do we not live as pleasantly as possible, without distress?
[Source]

Such it is, the life of miserable mortals:
neither wholly fortunate nor unfortunate.
He is prosperous and then he is not prosperous.
Why then, when we stand in uncertain happiness,
do we not live as pleasurably as possible, without distress.
[tr. Will (2015)]