that’s a good question
all human beings have a spiritual side – that is, as you said, a side that will last for eternity. Your spiritual life (zaos, in the Greek) is the part of you that will last forever; it is your soul.
the spiritual actions a person takes on this Earth are their attempts to prepare for eternity, either misguided preparation or solid preparation, the soul is involved.
i think that’s the answer…or rather, i think that’s what your question meant…
hope it helps
The Bible teaches that there is both a physical world and a spiritual world and that they coexist. Some people believe that there is a secular world and a sacred world and that those two are separate, but the Bible teaches that to the believer all things are sacred–everything we do, all the attitudes and thoughts we have–matter to God.
To be non-spiritual is to be bogged down in this duality by your ego, which keeps you from the truth and enlightenment.
To be spiritual here is to know that the ego is false, and only your soul/spirit knows the truth, following the truth that resides within leads you to self-fullness not selfishness.
there are three different parts to a mortal – the physical – the spirit – the soul. the physical container is the part which allows the soul and spirit to move around on the plane of existence. the soul returns to GOD who gave it and the spirit is the essence which remains as a part of the memory of those who knew or heard of the departed one. this was the way it was explained to me which made sense at the time.