θεσπεσίη

From LSJ

Ὅσον ζῇς, φαίνου, μηδὲν ὅλως σὺ λυποῦ· πρὸς ὀλίγον ἐστὶ τὸ ζῆν, τὸ τέλος ὁ χρόνος ἀπαιτεῖ. → While you live, shine; have no grief at all; life exists only for a short while, and time demands its toll.

Source

French (Bailly abrégé)

ης (ἡ) :
expression de la volonté divine.
Étymologie: θεσπέσιος.