Ibn Sina's Classification of Philosophy and Science

Ibn Sīnā’s (980–1037) classification of philosophy and science is a systematic categorization of knowledge based on its purpose and its relationship to human will, dividing it into two main categories: theoretical (nazarī), oriented toward the acquisition of truth, and practical (amelī), oriented toward action. Within the framework of the Peripatetic philosophical tradition, Ibn Sīnā constructed a coherent system of thought addressing the relationships between God, the universe, and humanity. While grounded in Aristotelian philosophy, this system was reorganized according to his own methodological approach. This classification, detailed in his works al-Madkhal and Risāla fī Aqsām al-ʿUlūm al-ʿAqliyya, the first book of his al-Shifā corpus, provides a framework that defines the types, scope, and functions of knowledge.

Ibn Sīnā’s Classification of Philosophy and Science (Generated with AI Assistance)

Fundamental Division of the Sciences and Theoretical Framework

In classifying the sciences, Ibn Sīnā bases his distinction on the purpose of knowledge and its relation to human will, dividing them into two main categories: theoretical (nazarī) and practical (amelī). Theoretical sciences aim at attaining true knowledge and deal with subjects that exist independently of human will; practical sciences aim at guiding action and deal with subjects that depend on human will. This distinction offers a systematic framework for organizing knowledge into its theoretical and practical dimensions.

Theoretical Sciences

The hierarchy of theoretical sciences consists of three fundamental levels: natural philosophy (physics), mathematics, and metaphysics. Natural philosophy examines entities related to matter and motion, and is subdivided into core disciplines such as celestial bodies, generation and corruption, the four elements, mineralogy, botany, zoology, and psychology. In addition, fields such as medicine, astrology, physiognomy, dream interpretation, talismans, and alchemy are included within this system as applied branches of natural philosophy.

Detailed Classification of Ibn Sīnā’s Philosophy and Science (Generated with AI Assistance)

Mathematical sciences encompass fundamental disciplines such as arithmetic, geometry, astronomy, and music. Their applied branches include technical skills developed to meet practical needs, such as Indian arithmetic, algebra, land surveying, optics, and engineering. Metaphysics, occupying the highest level of theoretical sciences, investigates being as such, causal relationships, and divine matters. Ibn Sīnā did not confine metaphysics to abstract ontology alone; he also treated issues such as prophecy, revelation, and the doctrine of the afterlife as secondary branches of metaphysics, grounding them in rational argumentation.

In Ibn Sīnā’s system, practical sciences exhibit a three-stage structure expanding from the individual to society. Ethics, concerned with regulating personal conduct; household management, dealing with family and domestic affairs; and politics, focused on establishing social order, constitute the core components of this category. These branches of practical philosophy serve the goal of securing human happiness and order in worldly life.

Practical Sciences and the Role of Logic

In the construction of this entire philosophical-scientific system, logic functions as the foundational “instrument.” Logic is regarded as the discipline that safeguards the mind from error and enables the attainment of true knowledge. Ibn Sīnā conceived logic as a nine-part process beginning with the Isāghūjī (Introduction), progressing through categories, propositions, syllogism, and demonstration, and extending to rhetoric and poetics. This systematic unity became a decisive model for the classification of sciences and their methodology in the Islamic intellectual tradition after Ibn Sīnā.