3954. What kind of idea he had of the soul or spirit, which he called pneuma, was shown to the life, for he became [himself] what he had conceived [the soul to be], to wit, something scarcely visible, but yet something of an ethereal nature, with a kind of general undulation or self-motion. Such was the idea that he had of the spirit, saying, that he knew his spirit would survive after death, because it was his interior essence, which could not die, as it possessed the power of thought; at the same time [he said] that he could not then entertain the same idea [on the subject] which he now had, but only that the general nature of thought was that of a certain breath which he breathed with a peculiar kind of motion. As to the quality of his life, he says that he did not make it a subject of distinct thought. This is what was said by Aristotle.