The heart is the first physical instrument through which the soul moves the other parts of the body. therefore as a mover, the soul is united to the other parts of the body through the medium of the heart. As the form of the body, the soul is united to every part of the body essentially and directly. the being of man is the union of matter and spirit, body and soul, one is incomplete without the other. It is the soul that abstracts from the physical image called the phantom image, the spiritual concepts The brain stores all of the imput of sensible realities, things that are sensed through the senses and fed to the brain. Again in this life the soul in dependent upon the body to supply it this sensory imput to be able to abstract intellectual concepts which are spiritual, concepts which will give the person understanding, knowledge of universal truths. The intellect;, a power of the soul does not need a bodily organ in its operations as the senses do. The human soul is the Act of an organic body because the body is an organ
The intelligible species (concepts) is made to be actually understood by abstraction from the phantasms; (sensible image) If the body fails in sensing, the soul will not be able to abstract thoughts from what is sensed, but the soul will still retain its abilities to abstract intelligible species (thoughts, which are spiritual, not physical, they can only be understood not sensed)