Discourses · Chapter
That the Logical Art Is Necessary explained
Epictetus argues that logic is essential as the tool for analyzing all other faculties, including reason itself.
What happens
Epictetus argues that logic is essential as the tool for analyzing all other faculties, including reason itself. He compares it to a measuring instrument that must be calibrated before use. He defends the study of logic against those who deem it unproductive, asserting that it enables us to distinguish truth from falsehood and to understand nature. He illustrates his point with the metaphor of a diviner interpreting entrails, showing that the true value lies not in the interpreter but in the divine signs revealed.
Themes in this chapter
Rationality and Self-Examination
The chapter centers on the necessity of analyzing reason itself through logic, emphasizing self-examination as the path to understanding truth and nature.
Philosophy as Practical Discipline
Epictetus argues that logic is not merely theoretical but serves the practical purpose of measuring and distinguishing, enabling right action and alignment with nature.
Characters to notice
- Epictetus
Primary speaker; defends the necessity of logic as the foundational art for examining reason and understanding nature.
- Chrysippus
Cited as a Stoic authority whose works interpret nature, but Epictetus emphasizes that Chrysippus is a means, not an end.
- Zeno
Mentioned alongside Chrysippus and Cleanthes as a Stoic philosopher who affirms the value of logic.
- Cleanthes
Listed as one of the Stoic teachers who support the importance of logic.
- Socrates
Referenced as an example of one who began education with the examination of names, underscoring the logical art.
Key passages
“Since reason is the faculty which analyses and perfects the rest, and it ought itself not to be unanalysed, by what should it be analysed?”
Because reason is the tool that examines and improves everything else, it must also be examined—but what could possibly analyze reason itself?
Epictetus poses the foundational question that justifies the study of logic as self-analytical.
“This is the reason, I suppose, why they (the Stoic teachers) place the logical art first, as in the measuring of corn we place first the examination of the measure.”
This is why the Stoics prioritize logic: just as you must check the measuring cup before measuring grain, you must first understand the tool of reason before using it.
Epictetus uses a practical analogy to explain why logic is the starting point of philosophy.
“Can any man hinder you from assenting to the truth? No man can. Can any man compel you to receive what is false? No man can.”
No one can prevent you from agreeing with what is true, nor force you to accept what is false—your power of assent is entirely your own.
Epictetus asserts the inviolable freedom of the will in matters of judgment, a core Stoic doctrine.