the Pair of Knowing and Object

I am searching for a precise understanding of what Buddhist authors mean by the "pair" of "knowing" and "object". For example > ...we see that what we call "self" is simply the pairwise progression of knowing and object. > A second example > In all perception, at each event of noting, there is always this twin > pair, the object and the mind, which observes the object. These two > elements of the object and the knowing mind always arise in pairs, > and apart from these 2, there does not exist any other thing in the > form of a 'person', an 'observer', an 'experiencer', nor any 'Ego', > 'Subject', or any 'Self'! No identity is present! Similarly is there > no 'observed object', or any 'substance' "out there" independent of > the mind! Can this "pair" of "knowing" and "object" be explained precisely? Or is it subject to many interpretations? What insight is gained from discussion of this pair of knowing and objects?