Rapid Polarization (vis-a-vis the power to abstract)

[βαθμιαίος]

a colossal, if not cosmic, "HINT-HINT" from the 7th density.

You mean 6th density? Ra is 6th density.

We presumably had an abundance of peace and agreement in space/time verses this time/space.

You have these backwards. Space/time is during incarnation; time/space is between incarnations.

Abstractly challenging is more than simply a philosophical predilection in 3D. It is a strict requirement for growth and rapid polarization in it as seen below:

<snip>

The fruit is between our ears, as is the passage to life, as is the passage to growth and Rapid Polarization: THE POWER TO ABSTRACT, QUESTION, and CHALLENGE, all for a tool towards RAPID POLARIZATION.

I think you are misreading the quote from Ra, or at least mis-emphasizing one part of it over the rest. It's not about the primacy of abstraction -- it's about the primacy of balance. Yes, abstraction is necessary for third density. But in this quote Ra is saying that the key to polarization is balance between the intuitive and the rational minds.