αἰτιολογητέον
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
English (LSJ)
verb. Adj.
A one must investigate causes, Epicur.Ep.1p.29U.
Greek (Liddell-Scott)
αἰτιολογητέον: ῥηματ. ἐπίθ., πρέπει νὰ ἀναζητήσῃ τις τὰς αἰτίας, νὰ δικαιολογήσῃ, νὰ αἰτιολογήσῃ τὸ πρᾶγμα, Διογ. Λ. 10. 80.
Spanish (DGE)
hay que indagar las causas ὑπὲρ τῶν μετεώρων Epicur.Ep.[2] 80.