εἰσί
From LSJ
Τὸ γὰρ περισσὰ πράσσειν οὐκ ἔχει νοῦν οὐδένα → There is no sense in doing things beyond the usual measure
English (LSJ)
3pl. of εἰμί (
A sum). εἶσι, 3sg. of εἶμι (ibo). εἰσῐδεῖν, Ep. εἰσιδέειν, aor. inf. of εἰσεῖδον; v. εἰσοράω.
Greek (Liddell-Scott)
εἰσί: εἰσίν, γ΄ πληθ. τοῦ εἰμὶ (ὑπάρχω).
French (Bailly abrégé)
3ᵉ pl. prés. de εἰμί.
English (Strong)
3rd person plural present indicative of εἰμί; they are: agree, are, be, dure, X is, were.