“If the transmigration of a soul takes place into a rational being, it simply becomes the soul of that body. But if the soul migrates into a brute beast, it follows the body outside, as a guardian spirit follows a man. For there could never be a rational soul in an irrational being.”
XX. On Transmigration of Souls, and how Souls are said to migrate into brute beasts.
On the Gods and the Cosmos
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Sallustius 56
Roman philosopher and writerRelated quotes

Accordingly, when in the process of time the senses act through many interactions of sense with sensible things, the reasoning is awakened mixed with these very sensible things and is borne along in the senses to the sensible things as in a ship. But the functioning reason begins to divide and separately consider what in sense were confused. ...But the reasoning does not know this to be actually universal except after it has made this abstraction from many singulars, and has reached one and the same universal by its judgement taken from many singulars.
Commentarius in Posteriorum Analyticorum Libros (c. 1217-1220)

“The soul follows the progress of the body, as it does the progress of education.”
p, 125
Man a Machine (1747)

First Tractate : The Animate and the Man, §3
The First Ennead (c. 250)

Source: To the Most Reverend Nun Xenia (c. 1344), p. 296

7 - 10
Auxiliaries to the Perception of Intelligible Natures
Context: The soul is bound to the body by a conversion to the corporeal passions; and again liberated by becoming impassive to the body.
That which nature binds, nature also dissolves: and that which the soul binds, the soul likewise dissolves. Nature, indeed, bound the body to the soul; but the soul binds herself to the body. Nature, therefore, liberates the body from the soul; but the soul liberates herself from the body.
Hence there is a twofold death; the one, indeed, universally known, in which the body is liberated from the soul; but the other peculiar to philosophers, in which the soul is liberated from the body. Nor does the one entirely follow the other.
We do not understand similarly in all things, but in a manner adapted to the essence of each. For intellectual objects we understand intellectually; but those that pertain to soul rationally. We apprehend plants spermatically; but bodies idolically (i. e., as images); and that which is above all these, super-intellectually and super-essentially.

“If a man is to live, he must be all alive, body, soul, mind, heart, spirit.”
Source: Thoughts in Solitude

“Begin to see yourself as a soul with a body rather than a body with a soul.”

“As a body everyone is single, as a soul never.”
Source: Steppenwolf (1927), p. 59

Source: The Reappearance of the Christ (1948), p. 324