The one thing Euthyphro does seem to come to appreciate by the end of the dialogue is the irony Socrates has been employing throughout. He leaves in a huff as it dawns on him that Socrates has made a fool of him. Perhaps in the future, Euthyphro will be more wary of claiming certain knowledge of things. Perhaps he will be more concerned with careful thought and investigation, with humbler yet more accurate claims to knowledge. This, more than any particular doctrine, is what Socrates had to teach.