473. But man does not know this from any light of reason, for that light is obscured by fallacies that arise from the appearances pertaining to the external bodily senses, and that are believed in. Man has no other feeling than that he lives from his own life, because the instrumental feels the principal to be its own, and is unable therefore to distinguish between the principal and the instrumental, for these two causes act together as one cause, according to a theory known in the learned world. The principal cause is life, and the instrumental cause is man's mind. The appearance is also that beasts possess life created within them, but this is a similar fallacy; for beasts are organs created to receive light and heat both from the natural world and from the spiritual world. For each species is a form of some natural love, and receives light and heat from the spirit world mediately through heaven and hell; the gentle beasts through heaven, and the fierce through hell. Man alone receives light and heat, that is, wisdom and love, immediately from the Lord. This is the difference.