I think it's a variation(or original form?) of
[face=SPIonic]a)gewme/trhtoj mhdei\j ei)si/tw.
allegedly by Euclid.(This form is on Lesson 39 of Chase and Phillips, which I just read yesterday
Those who don't know geometry do not come in!
Said to be inscribed on the gate of his school.
here the 3rd person singular imperative of [face=SPIonic]ei]mi[/face]
, to go.
(The greek sentence is directed to a single person. but plural form seemed natural for an English translation)