Because animism relies on an oral tradition of story-telling, there are no sacred texts in this religion. Lucretius, who lived between 96 to 55 B.C., was the first to write about animism. He was followed by Marcus Tullius Cicero, who lived from 106 to 43 B.C..
The first modern concept of animism appeared in the book "Primitive Culture," which was written by Sir Edward Burnett Tylor in 1871. In this study, Tylor brings up the idea that the doctrine of souls relates to the principle of psychic unity, in which all people who have ever lived have the same capacity to comprehend all the phenomena in the world. Today animism recognizes that all natural objects and even the universe have souls.