The sensory perception referred to in that acronym is not, really, extra.
It is as much part of our basic package as a nose.
At this moment, we’re moving through space at something like 67,000 mph.
Can you feel it?
There are always things going on in Life outside the job description of our “5 senses”. Countless things.
Can you feel WiFi?
Is it real?
The only reason this 6th Sense, as it is called, got dubbed so mysterious … is the compelling nature of Earthworld to draw attention outward. Lots ah stuff going on out there.
But beyond the magnificence of the 3 dimensions are worlds and worlds to Creation.
We all know that. We just forgot.

Using The Mind to understand things of the Spirit is like trying to change a tire with a fork. Wrong tool for the job.