[naive]

A wise man is he who knows that he knows nothing

Isn't that the same kind of analogy as "cogito ergo sum"?

Same kind of analogy only in that they were both concepts by great philosophers (edit: and not analogies). Polar opposite concepts though. Descartes intention was to logically prove at least one miniscule thing as universal truth, "i think therefore I am" was only a means to an end for such a purpose, whereas Socrates line of thought was that this sort of activity was essentially an act of thought masturbation as truths are never fully "known".