One of my favorite Benjamin Graham quotes:
Benjamin Graham Testimony to the Committee on Banking and Commerce Sen. William Fulbright, Chairman (11 March 1955)
Chairman: … One other question and I will desist. When you find a special situation and you decide, just for illustration, that you can buy for 10 and it is worth 30, and you take a position, and then you cannot realise it until a lot of other people decide it is worth 30, how is that process brought about – by advertising, or what happens? (Rephrasing) What causes a cheap stock to find its value?
Graham: That is one of the mysteries of our business, and it is a mystery to me as well as to everybody else. [But] we know from experience that eventually the market catches up with value.