When one lives in a dualistic universe (intellectually,) one has a dualistic view of reality, physical and spiritual. That is false, if only because humans are spiritual as well as physical (and rational) beings. Human beings can love and know, which makes them spiritual, rational, and physical.
The only other obvious spiritual Being is God, Who is the Source of physical reality and the Source of Rational and Spiritual Reality. If you want to make a diagram, you start on one side with God, Creator, Logos, and Spirit, then it becomes diverse from there to the Universe itself which is physical, rational (ideas,) and spiritual (ideals.)
Finally we have humanity the observers who unite and understand the universe physically, rationally, and spiritually through Knowledge (the arts and scie4nces,) Philosophy, which is how we think and how we know, and Theology and Ethics, or the spiritual aspect of life.
The universe is a unified system of three aspects of reality that God in God’s power, wisdom, and goodness designed. Of the universe were strictly physical, it would not be rational, because physical does not think. If the universe were not spiritual, it would not change or grow, because the physical on its own does not grow, is not alive.
People are able to express ideas in books made up of paper and ink. Does that mean that those ideas are physical? No way. Just as people are able to encode their experiences into ideas and words which they store in their minds, and then take those ideas and words and organize them into sentences and paragraphs and chapters to create a book. If the book accurately recreates the original experience and transmits it to others, it is successful.
The spiritual is more involved, so we use words, but also music, stories, drama and other tools to convey the spiritual meaning of life. The spiritual involves the emotional as well as the rational.
Of course the mind can be injured by damage to the brain. The physical and the rational and the spiritual are closely interdependent. On the other hand because knowledge can be separated from the mind by writing and speaking, this knowledge is preserved even after the mind is dead in the libraries of the world and the Bible.
We know that a person is dead if their body is dead. Now we understand that a person is dead if their brain and mind are dead, even if their physical self is able to live a long time on life supports. In a real sense a person is dead if she/he is spiritually dead (totally selfish), but the spirit can be revived if he/she turns to Jesus Christ for salvation.