The conversation goes over ground covered before-why Professor Adler's Chicago colleague Allan Bloom has hold of the wrong teaching method; why Aristotle is the greatest philosopher-but there are always new insights from this remarkable philosopher: "I would say to you, there's one and only one self-evident proposition in the whole field of moral thought, and that is: 'We ought to seek everything that's really good for us and nothing else.' Now, play that on your piano as follows. We'll test it as a proposition. Think the opposite: 'We ought not to seek what is really good for us; we ought to seek what is really bad for us.' Both of these are unthinkable. If the opposite of a proposition is unthinkable, then you have a self-evident truth."