ATC
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A FORTIORI, A possible empirical universal
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The a fortiori argument scheme is a clear example of a cross-cultural interpretive – argumentative rule.
Greco-Latin Tradition
In the Greco-Latin tradition all collections of argument schemes throughout the history of Western argumentation mention the a fortiori rule. Aristotle illustrates this rule via the following examples:
If even the gods are not omniscient, then certainly human beings are certainly not.
(Rhet, II, 23, 1397b15, RR, p. 359)
A man who strikes his father also strikes his neighbors […] for a man is less likely to strike his father than to strike his neighbors (ibid.).
The second argument can be used in the following situation. Somebody was assaulted. Who is guilty? We know that someone in the victim’s neighborhood committed violence against his own father. The a fortiori argument casts suspicion upon the person who has already committed more severely prohibited forms of violence. The conclusion is that the police should question him.
Muslim Legal Argumentation
In Muslim legal argumentation, the bi-l-awla argument corresponds exactly to the a fortiori argument. The issue is addressed in the Quran (Surah 17, verse 24), dealing with the respect that a child owes to his parents:
Do not make “pfff!” to them!
The prohibition refers to a minimal impolite retort of a child shrugging off or reluctantly obeying the words of his parents, puffing out a sigh of exasperation. The a fortiori principle extends this prohibition to all disrespectful behavior: “since it is forbidden even to say “pfff!” to one’s parents, it is all the more forbidden to say harsh words to them, bully or hit them”.
The prohibition takes its support on the lowest point on the scale, the epsilon of disrespect. Commentators have noted that an a fortiori argument can be a form of semantic deduction (Khallâf [1942], p. 216).
Talmudic Exegesis
The rules of Talmudic exegesis have been established by various authors following Hillel (1st century CE). The entry “Hermeneutics” in the Encyclopædia Judaïca, enumerates the thirteen interpretive rules of Rabbi Ishmael.
The first rule is qal va-homer, “how much more”, which goes from the “minor” (qal) to the “major” (homer) a fortiori. (Jacobs & Derovan 2007, p. 25).
This rule helps to determine what is lawful and what is not, for example it establishes the conditions under which the Easter sacrifice, Pesach, should be offered. The Bible asks that Pesach be offered at Easter. Some actions are forbidden on the Sabbath, so what is one to do when Pesach coincides with the Sabbath? The calculation a fortiori gives the answer: the Olat Tamid sacrifice (“daily burnt-offering” [1]) is offered daily, including on the Shabbat. Pesach is more important than Tamid (proof: if one does not respect Tamid, one does not incur penalties; if one does not respect Pesach, the sanctions are severe). Since not celebrating Pesach is more serious than not celebrating Tamid, and Tamid is lawful when Easter falls on the day of Shabbat, it is therefore a fortiori lawful to sacrifice Pesach when Easter falls on Sabbath.
The reasoning can be expressed as a rhetorical syllogism:
Problem: the Pesach sacrifice must be offered on Passover.
Some actions are forbidden on Shabbat
Question: What should we do when Passover coincides with Shabbat?
Data: We know that 1) the Tamid offering must be celebrated on Shabbat, and 2) Not celebrating Pesach is worse than not celebrating the Tamid offering.
Argumentation: Topos of the opposites on (2):
Celebrating Pesach is more important than celebrating Tamid.
This, combined with (1), leads to the conclusion:
Conclusion: Pesach can be celebrated when Easter coincides with Shabbat.
Chinese Tradition
Confucius, The Analects. Bk 11, §12. Trans. Robert Eno [3]
Ji Lu asked about serving the spirits. The Master said, “While you are yet not able to serve men, how could you be able to serve the spirits?”
“May I ask about death?”
“When you do not yet understand life, how could you understand death?”
Han Fei Tzu, “Precautions within the palace”. Trans. Burton Watson [4]
Thus, the actor Shih aided Lady Li to bring about the death of Shen-sheng and to set Hsi-ch’i on the throne.1 Now, if someone as close to the ruler as his own consort, and as dear to him as his own son, still cannot be trusted, then obviously no one else is to be trusted either.
1 Lady Li and Hsi-ch’i “forced Shen-sheng to commit suicide in 656 BC”. “Hsi-ch’i (…) succeeded to the throne in 651 BC” (Burton Watson’s note to the text)
UNIVERSAL PERSPECTIVE
A fortiori can therefore be considered a good candidate for universality. This is not surprising, since it is based on scalarity and comparison, which are found in all languages.
See A fortiori, Comparison, Argument scales – Laws of discourse,