Great reason: demoting the 'I' to an instrument
The body is the greater reason, and the 'I' is only one of its sayings.
延伸阅读
Demoting the master to a reporter
This speech does one thing: it reassigns posts. The 'I' that used to give the orders is rewritten as a report on the state of the body, and the body that used to be the vehicle is called a great reason. Its place in the argument is to cancel a privilege: self-explanation is no longer the final account but one piece of material to be read alongside others. The questioning in chapters 4 and 5 is built on this step.
Turning the question on yourself
Chapter 1's question was aimed outward, at other people's rules: who set this 'ought' for whom. This speech turns it round — what issues the orders inside the body is the Self (Selbst), and the 'I' is only the one it sends out to speak. That turn is the book's most important methodological step: a tool that can only be used on other people turns into name-calling within a few uses.
The shape of the demotion
What is being reconstructed is the thought behind the speech's assertions. The original argues nothing; the structure below is added by this course, and the third premise is added entire.
Cracks in this reading
The 'spirit reassigned, not abolished' reading as a testable specification
The reading under test: the speech demotes spirit to the body's instrument and reassigns it, without holding it to be an illusion or calling for its abolition.