“I went to one who had the reputation of wisdom, and observed him — his name I need not mention; he was a politician whom I selected for examination — and the result was as follows: When I began to talk with him, I could not help thinking that he was not really wise, although he was thought wise by many, and wiser still by himself; and I went and tried to explain to him that he thought himself wise, but was not really wise; and the consequence was that he hated me, and his enmity was shared by several who were present and heard me. So I left him, saying to myself, as I went away: Well, although I do not suppose that either of us knows anything really beautiful and good, I am better off than he is – for he knows nothing, and thinks that he knows. I neither know nor think that I know. In this latter particular, then, I seem to have slightly the advantage of him. Then I went to another, who had still higher philosophical pretensions, and my conclusion was exactly the same. I made another enemy of him, and of many others besides him” (Plato, Apology, Jowett trans.).
The greatest wisdom a human can have is to recognize what we don’t really know. This can be a touchy point, because people who think they just know things they imagine to be true usually don’t like to be told otherwise. But in most areas, the best we can aim for is well-founded belief, which is to say belief that is capable of responding resiliently and in good faith to open-ended Socratic questioning or dialogue, and thus is responsive to the space of reasons. (See also The Epistemic Modesty of Plato and Aristotle).