AC 9922 - What are memory-knowledges, and what do they do?

AC 9922 [3]
-- there are memory-knowledges of good,
and memory-knowledges of truth;
and that the truths in them
are again vessels recipient of good,
for the truths of faith are vessels of the good of love. . .
-- memory-knowledges are things of the memory
in the natural person;
-- the internal person
is opened by means of memory-knowledges;
-- memory-knowledges are means for growing wise,
and also means for becoming insane;
-- memory-knowledges are vessels of truth,
and truths are vessels of good;
-- memory-knowledges are of service to the internal person;
-- when memory-knowledges,
which are things of the external memory,
become of the life,
they vanish out of the external memory;
but remain inscribed on the internal memory;
-- the person who is in the truths of faith 
from the good of charity,
can be raised above memory-knowledges;
-- this is called being raised above the things of the senses;
-- when a person dies
he carries with him into the other life
the memory-knowledges, that is,
the things of the external memory;
but that they are then quiescent . . ..