Plato, Laws 761c

τε καὶ οἰκοδομήμασιν εὐπρεπέστερα, καὶ συνάγοντες μεταλλείαις νάματα, πάντα ἄφθονα ποιῶσιν, ὑδρείαις τε καθʼ ἑκάστας τὰς ὥρας, εἴ τί που ἄλσος ἢ τέμενος περὶ ταῦτα ἀφειμένον ᾖ, τὰ ῥεύματα ἀφιέντες εἰς αὐτὰ τὰ τῶν θεῶν ἱερά, κοσμῶσι. πανταχῇ δὲ ἐν τοῖς τοιούτοις γυμνάσια χρὴ κατασκευάζειν τοὺς νέους αὑτοῖς τε καὶ τοῖς γέρουσι γεροντικὰ λουτρὰ θερμὰ παρέχοντας, ὕλην παρατιθέντας αὔην

and by connecting the pools by hewn tunnels they shall make them all abundant, and by using water-pipes they shall beautify at all seasons of the year any sacred glebe or grove that may be close at hand, by directing the streams right into the temples of the gods. And everywhere in such spots the young men should erect gymnasia both for themselves and for the old men—providing warm baths for the old: they should keep there a plentiful supply of dry wood,