Miyar al-Ilm fi Fann al-Mantiq

Miyar al-Ilm fi Fann al-Mantiq (The Criterion of Knowledge in the Art of Logic) is a treatise on logic authored by Abu Hamid al-Ghazali (d. 505 AH / 1111 CE) Miyar al-Ilm fi Fann al-M…+1.

Background and Purpose

In the introduction to the work, al-Ghazali states two principal motives for its composition:

1. A general methodological purpose: To clarify the methods of intellectual reflection and elucidate the rules of syllogistic reasoning and inference, providing an instrument for assessing rational proofs just as prosody serves poetry and syntax serves grammatical declension Miyar al-Ilm fi Fann al-M….
2. A specific contextual purpose: To disclose and explain the logical terminology and conventions used in his refutation of the philosophers, Tahafut al-Falasifa (The Incoherence of the Philosophers), in which he engaged them according to their own technical idioms Miyar al-Ilm fi Fann al-M….

Because the scholarly interest of his era was primarily devoted to Islamic jurisprudence, al-Ghazali incorporated legal examples (amthila fiqhiyya) throughout the work to illustrate logical principles, asserting that reflection in jurisprudential matters operates under the same structural rules and conditions as rational inquiry, differing only in the derivation of premises Miyar al-Ilm fi Fann al-M….

Contents and Method

The work structures logical inquiry around the division of theoretical knowledge into conception (tasawwur) and assent (tasdiq) al-Radd ala al-Mantiqiyyi…+1:

• Definitions (al-hudud): The text expounds the foundations of explanatory speech (al-qawl al-sharih), which leads to conception and comprises formal definitions (hadd) and descriptions (rasm), while outlining their conditions and rules al-Radd ala al-Mantiqiyyi…+1.
• Proofs (al-hujaj): It outlines the principles of arguments leading to assent, primarily syllogisms (qiyas) and induction (istiqra'), explaining the requirements of demonstrative proof (burhan) and identifying the sources of error in argumentation al-Radd ala al-Mantiqiyyi…+1.

Significance and Reception

Al-Ghazali referred back to Miyar al-Ilm in several of his later works—including Mizan al-Amal, Al-Iqtisad fi al-I'tiqad, Jawahir al-Qur'an, and Al-Mustasfa—as his comprehensive reference for the rules of demonstration and logical criteria Mizan al-Amal+3.

The logical framework presented in the book, along with al-Ghazali's broader effort to integrate formal logic into Islamic disciplines such as legal theory, drew discussion and critique from later scholars Jahd al-Qariha fi Tajrid …+1. Notably, Ibn Taymiyya examined and critiqued al-Ghazali's formulations on definitions and syllogistic proofs from Miyar al-Ilm in his work Al-Radd 'ala al-Mantiqiyyin al-Radd ala al-Mantiqiyyi….