Any Soul can read the same spiritual books many times, life after life. This doesn’t mean the spiritual knowledge contained in the books is realized, until it is realized, ie. assimilated. After each life ends, the Soul forgets the knowledge forms contained in these books. Later, the Soul desires will lead the Soul to the same types of books in a next lifetime. These knowledge forms are Mercury. Once they are assimilated, they become Jupiter, and the Soul will not need to read these books again, because they are already part of what the Soul knows. Is this correct?
Yes. But also remember that Jupiter correlates with then nature of 'beliefs' in any given life, and Mercury will correlate to the information taken in to not only create beliefs, but to reinforce those beliefs. Of course what one 'believes' does not necessarily correlate with what is actually true from the point of view of all the natural laws and truths reflected in those laws as set in motion by the Creator Of All Things. Human can literally make themselves 'believe' anything which, to me, is one of the greatest problems human beings have. Many people 'believe' that the Earth is less than 10,000 years old and that human co-mingled with the Dinosaurs for example. And that belief then correlates to what is 'true' for them even though is it not actually true.
This is why the 12th House naturally squares the 9th House: the necessity of a Soul to be disillusioned from anything that is not actually true which then leads, at some point. to that which is true.
So the Soul in fact can carry forwards into future lives the nature of 'beliefs' and the information necessary that 'informs' those beliefs.
In terms of a Soul 'knowing' that which is true, realizing that from within, that knowing of that truth(s) will in fact be carried forwards as you have rightly stated.
Is it possible for a Soul to remember knowledge forms or 'information' from prior lifetimes, which, though, have not been assimilated? Can Uranus/Mercury memory contain un-integrated knowledge forms of intellectual nature, ie. Mercury, from past lifetimes?
God Bless, Rad