This is a big topic. There is a learning curve, and a lot of false perceptions. Bear with me, and I will work to get us on the same page of understanding.
The Spiritual is a particular thing, like gravity. There are rules to it. There is cause and effect. It is something that pagans and non-Christians have talked about. It is something that is referenced and inferred in the Bible and Christianity. It all works in particular ways. There is one Truth to it.
The spiritual is “Other Dimensional.” Is that 4th or 5th dimensional? It is other dimensional…like “Stranger Things.” Other Dimensional things work differently than how you have perceived. Prophet Ezekiel in Ezekiel 1, he had a vision of Angels. He was “Seeing” the Spiritual. The Spiritual being other dimensional and complicated, we have understood with allegories. Given someone was saying “The Bible is Allegorical,” in what context were they saying it? The allegorical elements of the Bible are spiritual in nature.
The Veil
In the Temple of Jerusalem, there was a place called The Holy of Holies. The Holy of Holies is where God’s very presence dwelt, and the Ark of the Covenant was kept. It was separated from the rest of the temple by a curtain or veil. Only the High Priest was allowed back there, and only once a year during Yom Kippur. He would crawl in on his hands and knees, with a cord tied around his waste. Given he came into the presence of God with sin or gross things in his heart or soul, or in an unclean state, he may have died. The cord was there to pull him out.
Between the physical and the spiritual there has been a veil. An Apocalypse is an opening of the eyes, a tearing away of the veil from hidden things. When Jesus died on the cross, the veil tore. That may be the veil or curtain in the temple. It may be the veil or curtain separating the physical from the spiritual. Spiritual things tend to work parallel with the physical. Man is made in the image of God. The Spiritual is a reflection of something.
What I just explained there, we may be able to find Western Occult people and gnostics use similar words. Satan was a liar and a thief. The Spiritual is a particular objective thing. It works in a particular ways.
The Veil that separates the Physical from the Spiritual is there for mankind’s protection. In a fallen state, given man was in the presence of God, he may die.