Plato, Laws 737d

πλησιοχώρων πόλεις· γῆ μὲν ὁπόση πόσους σώφρονας ὄντας ἱκανὴ τρέφειν, πλείονος δὲ οὐδὲν προσδεῖ, πλήθους δέ, ὁπόσοι τοὺς προσχώρους ἀδικοῦντάς τε αὐτοὺς ἀμύνασθαι δυνατοὶ καὶ γείτοσιν ἑαυτῶν ἀδικουμένοις βοηθῆσαι μὴ παντάπασιν ἀπόρως δύναιντʼ ἄν. ταῦτα δέ, ἰδόντες τὴν χώραν καὶ τοὺς γείτονας, ὁριούμεθα ἔργῳ καὶ λόγοις· νῦν δὲ σχήματος ἕνεκα καὶ ὑπογραφῆς, ἵνα περαίνηται, πρὸς τὴν νομοθεσίαν ὁ λόγος ἴτω.

Of land we need as much as is capable of supporting so many inhabitants of temperate habits, and we need no more; and as to population, we need a number such that they will be able to defend themselves against injury from adjoining peoples, and capable also of lending some aid to their neighbors when injured. These matters we shall determine, both verbally and actually, when we have inspected the territory and its neighbors; but for the present it is only a sketch in outline of our legislation that our argument will now proceed to complete.