The Spirits' Book
Book One - First Causes
Chapter IV - Vital Principle
Organic and Inorganic Beings
66. Is the vital principle the same for all organic beings?
“Yes, but adapted according to each species. This principle gives organic beings the power of initiating movement and activity. They are distinguished from inert matter by their ability to produce spontaneous movement. Inert matter can be moved, but it does not initiate movement.”