8. What other cause, besides the preceding, will we have to invoke so as to let nothing occur without a cause, to maintain order and interdependence of things in the world, and in order to preserve the possibility of predictions and omens without destroying our personality? We shall have to introduce among the number of beings another principle, namely: the soul; and not only the World-soul, but even the individual soul of every person. In the universal concatenation of causes and effects, this soul is a principle of no little importance, because, instead of, like all other things, being born of a "seminal reason," it constitutes a "primary cause." Outside of a body, she remains absolute mistress of herself, free and independent of the cause which administers the world. As soon as she has descended into a body, she is no longer so independent, for she then forms part of the order to which all things are subjected. Now, inasmuch as the accidents of fortune, that is to say, the surrounding circumstances, determine many events, the soul alternately yields to the influence of external circumstances, and then again she dominates them, and does what she pleases. This she does more or less, according as she is good or evil. When she yields to the corporeal temperament, she is necessarily subjected to desire or anger, discouraged in poverty, or proud in prosperity, as well as tyrannical in the exercise of power. But she can resist all these evil tendencies if her disposition is good; she modifies her surroundings more than she is affected by them; some things she changes, others she tolerates without herself incurring guilt. THE SOUL IS FREE WHEN FOLLOWING REASON. 9. All things therefore, which result either from a choice by the soul, or from exterior circumstances, are "necessary," or determined by a cause. Could anything, indeed, be found outside of these causes? If we gather into one glance all the causes we admit, we find the principles that produce everything, provided we count, amidst external causes, the influence exercised by the course of the stars. When a soul makes a decision, and carries it out because she is impelled thereto by external things, and yields to a blind impulse, we should not consider her determination and action to be free. The soul is not free when, perverting herself, she does not make decisions which direct her in the straight path. On the contrary, when she follows her own guide, pure and impassible reason, her determination is really voluntary, free and independent, and the deed she performs is really her own work, and not the consequence of an exterior impulse; she derives it from her inner power, her pure being, from the primary and sovereign principle which directs her, being deceived by no ignorance, nor vanquished by the power of appetites; for when the appetites invade the soul, and subdue her, they drag her with them by their violence, and she is rather "passive" than "active" in what she does.