Yes.

Then, as would seem, in doing good, he may act wisely or temperately, and
be wise or temperate, but not know his own wisdom or temperance?

But that, Socrates, he said, is impossible; and therefore if this is, as
you imply, the necessary consequence of any of my previous admissions, I
will withdraw them, rather than admit that a man can be temperate or wise
who does not know himself; and I am not ashamed to confess that I was in
error. For self-knowledge would certainly be maintained by me to be the
very essence of knowledge, and in this I agree with him who dedicated the
inscription, 'Know thyself!' at Delphi. That word, if I am not mistaken,
is put there as a sort of salutation which the god addresses to those who
enter the temple; as much as to say that the ordinary salutation of 'Hail!'
is not right, and that the exhortation 'Be temperate!' would be a far
better way of saluting one another. The notion of him who dedicated the
inscription was, as I believe, that the god speaks to those who enter his
temple, not as men speak; but, when a worshipper enters, the first word
which he hears is 'Be temperate!' This, however, like a prophet he
expresses in a sort of riddle, for 'Know thyself!' and 'Be temperate!' are
the same, as I maintain, and as the letters imply (Greek), and yet they may
be easily misunderstood; and succeeding sages who added 'Never too much,'
or, 'Give a pledge, and evil is nigh at hand,' would appear to have so
misunderstood them; for they imagined that 'Know thyself!' was a piece of
advice which the god gave, and not his salutation of the worshippers at
their first coming in; and they dedicated their own inscription under the
idea that they too would give equally useful pieces of advice. Shall I
tell you, Socrates, why I say all this? My object is to leave the previous
discussion (in which I know not whether you or I are more right, but, at