I started this section of our study with the causes arising in the astral and etheric bodies because they are the major sources of trouble, owing to the fact that the bulk of humanity is astrally focused, just as the bulk of the forms in the animal kingdom are etherically focused. The forces pouring into the animal kingdom come predominantly from etheric levels and from the dense physical levels of life. The higher animals, however, owing to the development brought about through their contact with human beings, are becoming susceptible to forces coming from the astral plane, and they thus develop actions and reactions which are not purely instinctual.