Free thought is an illusion, once it is constructed to comply with acceptable norms.
The most difficult challenge in adapting to the awareness of eternal existence is the default nature of human training. Once this new concept is breached, there is often an attempt to blend non-testable or provable philosophical foundations upon a total unknown. There should only be two concerns to the Eternalist:
To be able to operate agnostically through diverse realities
To Identify and adapt, or adapt and identify
Foundations installed by those not concerned with anything more than limited sets of existence are not malleable to defining purpose nor intent in open sets. It takes courage to be able to deconstruct all of which your past was built and build a foundation for yourself that is timeless.