Yes, it seems that the earliest (Egyptian) references make it out as "know your place", and that even the earliest Greek references put a slightly nicer but still comparable "be moderate, self-restrained".
But there are several references by Plato that are relevant to the interpretation that I implied (to know yourself = to know your moral standpoint) mentioned in the Wikipedia article:
(Plato's Phaedrus dialogue) Socrates says, "But I have no leisure for them at all; and the reason, my friend, is this: I am not yet able, as the Delphic inscription has it, to know myself; so it seems to me ridiculous, when I do not yet know that, to investigate irrelevant things."
(Plato's Protagoras dialogue) Socrates mentions "the far-famed inscriptions, which are in all men's mouths,--'Know thyself,' and 'Nothing too much'.". Having lauded the maxims, Socrates then spends a great deal of time getting to the bottom of what one of them means, the saying of Pittacus, 'Hard is it to be good.' The irony here is that although the sayings of Delphi bear 'great force,' it is not clear how to live life in accordance with their meanings. Although, the concise and broad nature of the sayings suggests the active partaking in the usage and personal discovery of each maxim; as if the intended nature of the saying lay not in the words but the self-reflection and self-referencing of the person thereof.
But there are several references by Plato that are relevant to the interpretation that I implied (to know yourself = to know your moral standpoint) mentioned in the Wikipedia article:
(Plato's Phaedrus dialogue) Socrates says, "But I have no leisure for them at all; and the reason, my friend, is this: I am not yet able, as the Delphic inscription has it, to know myself; so it seems to me ridiculous, when I do not yet know that, to investigate irrelevant things."
(Plato's Protagoras dialogue) Socrates mentions "the far-famed inscriptions, which are in all men's mouths,--'Know thyself,' and 'Nothing too much'.". Having lauded the maxims, Socrates then spends a great deal of time getting to the bottom of what one of them means, the saying of Pittacus, 'Hard is it to be good.' The irony here is that although the sayings of Delphi bear 'great force,' it is not clear how to live life in accordance with their meanings. Although, the concise and broad nature of the sayings suggests the active partaking in the usage and personal discovery of each maxim; as if the intended nature of the saying lay not in the words but the self-reflection and self-referencing of the person thereof.