I read Matthew 8 this morning, in which the physical and spiritual worlds collide with the advent of Jesus' ministry on earth. He heals with a word, calms a storm the same way; casts demons into pigs and, rather than give thanks that the demons are gone, the people complain about the loss of pigs.
Human beings, alone among physical creatures, have spirits. The physical and spiritual worlds collide in every human being. Everything else that is physical is only physical. Everything else that is spiritual (angels, demons, Our Heavenly Father, cherubim, etc) is only spiritual. Only humans (including Jesus) are both.
The physical and spiritual worlds meet in the human mind. Our mind is physical- without your brain-meat your mind doesn't function! Our mind is spiritual and non-physical. We can think immaterial thoughts and contact God and control our physical bodies with our mental powers.
The spiritual immaterial part of a Christian's mind- his spirit or soul, has been regenerated and seeks God. The physical, the human brain, is still "flesh"- unredeemed until we die and our raised with new bodies, new brains - and still has lots of bad habits and inclinations.
In Matthew 8, at the onset of his revelation of how to be fully human, Jesus demonstrated that a person who is walking with God has authority over the physical world, authority over the spiritual world, and can live in the spirit of Romans 8:28 (Jesus' calm in the storm) because God's peace and love control his spirit and he knows that when this body is lost it will be replaced by one that isn't defective.
He has this authority because God has this authority and he lives only for God's glory and will.
The people in Matthew 8 didn't get it. Do we?