The spiritual realm
The spiritual realm is merely that which contains non-material non-physical reality. This, in contrast to the physical realm.
The Bible refers to the spiritual realm, calling it "heaven", or "heavenly".
There seems to be various non-material aspects of reality, such as:
Since these things seem non-material, there must be a spiritual realm within which they reside.
Examples of things residing within the spiritual realm:
We can't know anything about the structure or functioning of the spiritual realm except from the Bible.
In discussing my view of the spiritual realm, I sometimes use the analogy of another dimension outside space and time. But to clarify: The spiritual realm is not merely another dimension within the physical realm, within the universe. Rather, it is dualist (mind-body dualism), not materialist/physicalist.
Purpose is merely information embedded within the structure of matter. Our conscious mind is able to examine matter and see the information. (How does the brain do this?)
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There is more to reality than the physical material world. The subjective experience of consciousness demonstrates this, as do the mental faculties of human reason and the human mind.
Evidences of the existence of a spiritual realm (mind-body dualism):