Stoicism followed the neoplatonic depreciation of passion or feeling. Reason, the faculty of mind or spirit, had to be the mainspring of action and life; the act of virtue must come from the knowledge of reason; reason being naturally good, the more nearly a man became pure reason, the more he approximated ideal reason and good. The “summum bonum” or highest good of man is the regulation of passion and the total ordering of life by passionless reason. The law of nature is virtue, a rational or passionless good; “nature” definitely did not mean the material world but the world of Ideas or Forms. The irrational nature of man must be suppressed and subjugated by his rational and true nature. The world of reason or nature is a passionless, determined, impersonal world, and as a result Stoicism was fatalistic. The world of necessity is the world of reason, whereas the world of freedom is the anarchistic world of personality, feeling, and imperfection.
Rushdoony, R. J.. The Flight From Humanity: A Study of the Effect of Neoplatonism on Christianity (Kindle Locations 350-356). Chalcedon/Ross House Books. Kindle Edition.