Of all treasures this is best:
To find a noble-minded wife.

[τῶν γὰρ πλούτων ὅδ’ ἄριστος
γενναῖον λέχος εὑρεῖν.]

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

Andromeda [Ανδρομέδα], frag. 137 (TGF) (412 BC)

Nauck frag. 137, Barnes frag. 30, Musgrave frag. 14. (Source (Greek)). Alternate translations:

The best of treasures is a virtuous Wife.
[tr. Wodhall (1809)]

Best of all riches is to find a noble spouse.
[tr. @sentaniq (2014)]