Kant began by identifying a premise common to both empiricists and rationalists. They had assumed that knowledge must be objective. That is, they took for granted that the object of knowledge sets the terms and that therefore it was up to the subject to identify the object on the object’s terms. In other words, the empiricists and the rationalists were realists: they believed that reality is what it is independently of consciousness, and that the purpose of consciousness is to come to an awareness of reality as it is. In Kant’s terms, they assumed that the subject is to conform to object.
Sam Harris' view in a nutshell.
