However, all five levels mentioned above are levels of the “Intellectual Soul” which is called “The Natural, Vivifying Soul”, in that it too must agree and acknowledge, with acknowledgement and excitement of the mind and heart, and ultimately include the intent and simple desire etc. Nonetheless, this is all called, “One who serves G_d with his body”, rather than, “One who serves G_d with his soul.”
This is because, in and of itself, the Divine soul is literally a Divine power. All of its five levels; Nefesh, Ruach, Neshamah, Chaya and Yechidah are all in a state of Divine rather than physical excitement – literally. Only that it is invested in the physical brain and heart, so that its illumination and the spreading forth of its influence likewise come into the physical brain and heart in an aspect of five levels too. The lowest level is that the heart senses the Divine excitement of the soul, as mentioned above.
To explain this, we must first have a fine understanding into the matter of the Divine excitement of the soul in a general way, as mentioned above concerning the general categories between actual Divine excitement and the excitement of the life of the flesh. This is because Divine excitement is the principle aim and true basis for true Divine inspiration, which is the ultimate goal in contemplating the words of the Living G_d. This is the above mentioned matter of “Adhesion”, which is called, “Essential Life”, as in the verse, “You who adhere to HaShem your G_d are all alive today.” This is also the meaning of the verse, “For He is your life etc.”