5. The spiritual and vital principle are by no means one and the same thing!
Commencing always with the observation of facts, if the vital principle were inseparable from the intelligent principle, there would be some sense in confounding them. But, as we see some beings who live without thinking, like plants - beings animated with organic life, who give no manifestation of thought; as there are produced in living beings active movements independent of the act of the will; as during sleep organic life is in all its activity, whilst intellectual life does not manifest itself by any exterior sign - we are induced to conclude that organic life resides in a principle inherent in matter, independent of the spiritual life which is inherent in Spirit. Consequently, as matter possesses vitality independent of Spirit, it is evident that this double vitality reposes upon two different principles (Chap. X, n° 16 to 19).