In your opinion, that statement is important because a/there is no falsifiable evidence for the claim and b/ many people go by the falsifiable evidence.
In tradition, the soul would be analogous to our memory. A divine soul would be composed of our lifetimes memory, going forward into eternity, with this full range of data, experience, and knowledge what defines us, as us. We need our memory to maintain our unique continuity.
The soul was considered static, in tradition, like a hard drive. It is the spirit that animates the soul. Computer memory is static, until the CPU animates the memory. The CPU is connected to the spirit, which will help process the data within memory, in different ways.
In the case of humans, if we get hungry, the spirit will make us thin about our food memories, and what needs to be done to eat. The hunger spirit; biochemical triggers, will animate the soul; memory, and we consciously act along these memory lines; to gather, to prepare and to eat.
Animals have both a soul and a spirit; animal spirit=instincts. Their soul will contain memories of their own hunting and gathering grounds and their favorite foods. The spirit awakes their hunger and they begin, with firmware supporting their hunting actions via their soul.
In terms of the operating system of the human brain, humans have three basic levels of spirits; multi-core processor, that all come from the inner self; CPU. Each core will deal with different aspects of our memory. The highest level is connected to the archetypes of meaning; analysis of reality. Thinking is passive to the body, but can be quite active in the brain. These spirits seek meaning; why?
The lowest level is connected to our instinctive needs; sleep to fight and fight. While the middle range spirits are connected to archetypes of relationship. The spirit of relationship are not just human relationships, but is also connected to how things/objects relate to each other in space and time. Santa Claus has a white beard and Red Suit; relationships. This is not rational, but is accepted as part of Western cultural relationships. It is defined this way, not necessarily due to logic. It could be sometimes felt, due to a 3-D symbolic connection; feels right due to group and historical acceptance. One would need to use the highest level to figure out why, this is way?
Political parties tend to be more middle level; ways to relate to each other and culture. Do not expect an answer for why, from the POV of the middle level. It can become dogmatic if we stay with only middle level spirits.