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[Ashim]

I don't believe Ra ever specifically said who\what his teachers are.  I sort of got the feeling they were the light-bringers/Guardians from beyond the octave, who "also wander" and "come to aid our octave in its Logos completion."  (52.12)  He doesn't SAY they're his own teachers, but it seems like a reasonable assumption.

Because on the matter of 7D, he says pretty clearly:  "At the seventh level or dimension, we shall, if our humble efforts are sufficient, become one with all, thus having no memory, no identity, no past or future, but existing in the all."  (16.22)  It's very hard for me to imagine how an entity in such a state could ALSO be taking time to chat personally with channeling humans.  A 7D entity even giving itself a name\personality would be in contradiction to this state, as Ra describes it, whereas Hathor almost immediately starts talking about their history.

Also, just as a more personal opinion:  This Hathor "sounds" 5D.  Skimming over the material, like their introduction of themselves, both their manner of speaking and their topics of interest are fairly similar to other 5D channeled sources.  

This isn't to denigrate them, of course.  They sound quite pleasant and interesting.  But I'm just not finding it likely that they're 7D by Ra's scale.

Still do not agree. Ra refers to seven as "the gateway cycle", so during 7th density a group will not yet have traversed into the next octave.
Ra states in your quote above that they will "become" "one with all" at that level if their efforts are sufficient, so not only would the memory complex still be in tact but they would also be able to act as teachers to lower density groups and walk the universe with "unfettered tread".