2 What does neural implementation imply as to soundness of knowledge - as well as of thought in general?

Perfection and absoluteness are not attributes of physical entities. Knowledge, according to Postulates 1 and 2 and Lemma, is a physical process; consequently, it is not endowed with those properties. In particular, human knowledge is expectedly affected by the limits and idiosyncrasies inherent in the small mass of biological material enclosed by the human skull, although marvellously organized. On the other hand, the complex developmental process which the brain undergoes during growth, its mutability over time, vulnerability to external agents, differences from person to person, all appear to point towards a relativistic and precarious character.