permanence
From LSJ
πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
English > Greek (Woodhouse)
substantive
durability: P. βεβαιότης, ἡ.
never would there be permanence of any law: V. οὐκ ἄν ποτε κατάστασις γένοιτ' ἂν οὐδένος νόμου (Sophocles, Ajax 1246).