My interpretation: humans have a tendency, upon creating a node in their minds that represents a given object (or event, or class of object, or class of events, or other representable thing), to thereafter stop paying much attention to the object (or whatever) itself. For example, I've seen a U.S.quarter thousands of times, but I would have a very hard time drawing one from memory, or even selecting the correct face from a set of plausible alternatives, because I really don't pay attention to what a quarter looks like... I merely examine the object for long enough to identify it as a quarter, and then I pay attention to other things instead.

One way of describing this behavior on my part is to say that, upon "remembering the name" of the thing I'm seeing (that is, on identifying it as a quarter) I give up actually "seeing" it (that is, actually attending to the particulars of the thing).

And so Paul observes that, by contrast, if I am to actually "see," I must in so doing suppress the act of "remembering the name."