Spiritual

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How do you shift realities? Like what to do, what do you have to script, how do you get back, etc.?
Why can't souls meditate/reflect in their own soul universe and move onto higher states of consciousness? Why do they need a physical body to do this? Is it not like coming one step down when one wants to go up?
Is the ontological truth that “something exists” unconditionally certain? For example, is the fact that “something exists” necessarily certain regardless of the time? If “something exists” at one point, does something always exist?