Panchadashi 1.17

The other one has fallen under control of lack of science. Due to the variety within lack of science, it becomes many from one. That lack of science is called the causal body. He who arrogates that lack of science (which is calling itself the causal body) is called "praajnya".

Reflected in lack of science, the self that is subservient to that lack of science is called the soul. Due to the variety (or variation of impurity) of that adjunct in the form of lack of science, also becomes many fold. He begins to be seen as gods, humans, animals, birds, with such kinds of differences. That lack of science alone is called the "causal body". It is said to be the cause of the gross and subtle bodies, as well as the gross and subtle beings. He who arrogates the causal body, in other words, he the soul who places the "I am" notion in that causal body is known as the "praajnya".