In "The First Degree of Introduction to Gnosis" we read "It is natural that all students will begin with this degree and eventually continue with the first, second, third degrees, etc".

Does anyone know if there were specifically intended texts by Samael Aun Weor to represent these "second" and "third degrees", etc?

Was there ever an actually intended sequence of degrees available in his books, beginning with "Introduction to Gnosis"?

This book remains one of my favorite books to practice but has anyone ever noticed or commented before on the fact that the majority of "Introduction to Gnosis" has been clearly replicated without any credit from Dale Carnegie's "How to Win Friends and Influence People"?

Samael's book is certainly a more refined and beautiful version in my opinion, but it has clearly been taken in significant details from this external source, without any reference/credit besides hinting to Carnegie as "a great author deduced..." at the beginning of Lesson Two.

I would particularly like to understand the deeper knowledge of the Tattvas in Lesson Three - (though the original formula for this was later modified by Samael after having written it down presumably without yet experiencing it for himself). I have not personally found that his modification found in "Ens Espirituale" is particularly any better - for there does not appear to be greater success of projects during cold and rainy days (Apas) for example, or that our businesses could more likely fail if we do them on dry, sultry days (akash).

Does anybody have any further resources or experiences on how to utilize the Tattvas for what he initially stated in "Introduction to Gnosis" that they might be utilized for?

Thank you for your time and your efforts in these answers - it is deeply appreciated!