14.I had resigned myself to Macarthur and his crimes never being more than partially knowable, like an underexposed photograph whose subject is visible only as a darkness.
15.We can, of course, distinguish between something that is at the moment unknown (but potentially knowable) and something that is permanently unknowable.
18.But to say that something is permanently unknowable is contradictory, because such a statement implies that we already know that something is, and to that extent it is knowable.
19.But then quantum physics came around and basically replaced these certainties with the concept of probability, with the idea that there are aspects of our world that are not knowable, that cannot be quantified.
20.This was not always so; as a result, the history of reference books is interesting in itself, for it can tell us much about changes in men's opinions as to what is knowable.