The main influence on al-Farabi’s philosophy was the neo-Aristotelian tradition of Alexandria. A prolific writer, he is credited with over one hundred works. Some other significant influences on his work were the planetary model of Ptolemy and elements of Neo-Platonism, particularly metaphysics and practical (or political) philosophy (which bears more resemblance to Plato’s Republic than Aristotle’s Politics).
He tried to gather the ideas of Plato and Aristotle in his book “The gathering of the ideas of the two philosophers”. His success should be measured by the honorific title of “the second master” of philosophy (Aristotle being the first), by which he was known.
Metaphysics and cosmology:
In contrast to al-Kindi, who considered the subject of metaphysics to be God, al-Farabi believed that it was concerned primarily with being qua being (that is, being in of itself), and this is related to God only to the extent that God is a principle of absolute being.
Al-Farabi’s cosmology is essentially based upon three pillars: Aristotelian metaphysics of causation, highly developed Plutonian emanational cosmology and the Ptolemaic astronomy. In his model, the universe is viewed as a number of concentric circles; the outermost sphere or “first heaven”, the sphere of fixed stars, Saturn, Jupiter, Mars, the Sun, Venus, Mercury and finally, the Moon. At the centre of these concentric circles is the sub-lunar realm which contains the material world. Each of these circles represent the domain of the secondary intelligences (symbolized by the celestial bodies themselves), which act as causal intermediaries between the First Cause (in this case, God) and the material world. Furthermore these are said to have emanated from God, who is both their formal and efficient cause. This departs radically from the view of Aristotle, who considered God to be solely a formal cause for the movement of the spheres, but by doing so it renders the model more compatible with the ideas of the theologians.
The process of emanation begins (metaphysically, not temporally) with the First Cause, whose principal activity is self-contemplation. And it is this intellectual activity that underlies its role in the creation of the universe. The First Cause, by thinking of itself, “overflows” and the incorporeal entity of the second intellect “emanates” from it. Like its predecessor, the second intellect also thinks about itself, and thereby brings its celestial sphere (in this case, the sphere of fixed stars) into being, but in addition to this it must also contemplate upon the First Cause, and this causes the “emanation” of the next intellect. The cascade of emanation continues until it reaches the tenth intellect, beneath which is the material world. It should be noted that this process is based upon necessity as opposed to will. In other words, God does not have a choice whether or not to create the universe, but by virtue of His own existence, He causes it to be. This view also suggests that the universe is eternal, and both of these points were criticized by al-Ghazali in his attack on the philosophers.
In his discussion of the First Cause (or God), al-Farabi relies heavily on negative theology. He says that it cannot be known by intellectual means, such as dialectical division or definition, because the terms used in these processes to define a thing constitute its substance. This would suggest that the more philosophically simple a thing is, the more perfect it is. Each succeeding level in this structure has as its principal qualities multiplicity and deficiency, and it is this ever-increasing complexity that typifies the material world.
Epistemology and eschatology:
Human beings are unique in al-Farabi’s vision of the universe because they stand between two worlds: the “higher”, immaterial world of the celestial intellects and universal intelligibles and the “lower”, material world of generation and decay; they inhabit a physical body, and so belong to the “lower” world, but they also have a rational capacity, which connects them to the “higher” realm. Each level of existence in al-Farabi’s cosmology is characterized by its movement towards perfection, which is to become like the First Cause; a perfect intellect. Human perfection (or “happiness”), then, is equated with constant intellection and contemplation.
Al-Farabi divides intellect into four categories: potential, actual, acquired and the Agent. The first three are the different states of the human intellect and the fourth is the Tenth Intellect (the moon) in his emanational cosmology. By thinking, al-Farabi means abstracting universal intelligibles from the sensory forms of objects which have been apprehended and retained in the individual’s imagination.
This motion from potentiality to actuality requires the Agent Intellect to act upon the retained sensory forms; just as the Sun illuminates the physical world to allow us to see, the Agent Intellect illuminates the world of intelligibles to allow us to think. This illumination removes all accident (such as time, place, and quality) and physicality from them, converting them into primary intelligibles, which are logical principles such as “the whole is greater than the part”. Because the Agent Intellect knows all of the intelligibles, this means that when the human intellect knows all of them, it becomes associated with the Agent Intellect’s perfection and is known as the acquired Intellect.
And it is by choosing what is ethical and contemplating about what constitutes the nature of ethics that the actual intellect can become “like” the active intellect, thereby attaining perfection. It is only by this process that a human soul may survive death, and live on in the afterlife.
According to al-Farabi, the afterlife is not the personal experience commonly conceived of by religious traditions such as Islam and Christianity. Any individual or distinguishing features of the soul are annihilated after the death of the body; only the rational faculty survives (and then, only if it has attained perfection), which becomes one with all other rational souls within the agent intellect and enters a realm of pure intelligence.
Psychology, the soul and prophetic knowledge:
In his treatment of the human soul, al-Farabi draws on a basic Aristotelian outline, which is informed by the commentaries of later Greek thinkers. He says it is composed of four faculties: The appetitive (the desire for, or aversion to an object of sense), the sensitive (the perception by the senses of corporeal substances), the imaginative (the faculty which retains images of sensible objects after they have been perceived, and then separates and combines them for a number of ends), and the rational, which is the faculty of intellection. It is the last of these which is unique to human beings and distinguishes them from plants and animals. It is also the only part of the soul to survive the death of the body.
Special attention must be given to al-Farabi’s treatment of the soul’s imaginative faculty, which is essential to his interpretation of prophet hood and prophetic knowledge. Therefore what makes prophetic knowledge unique is not its content, which is also accessible to philosophers through demonstration and intellection, but rather the form that it is given by the prophet’s imagination.
Practical philosophy (ethics and politics):
The practical application of philosophy is a major concern expressed by al-Farabi in many of his works, and while the majority of his philosophical output has been influenced by Aristotelian thought, his practical philosophy is unmistakably based on that of Plato. In a similar manner to Plato’s Republic, al-Farabi emphasizes that philosophy is both a theoretical and practical discipline; labeling those philosophers who do not apply their erudition to practical pursuits as “futile philosophers”. Al-Farabi compares the philosopher’s role in relation to society with a physician in relation to the body; the body’s health is affected by the “balance of its humors” just as the city is determined by the moral habits of its people. The philosopher’s duty, he says, is to establish a “virtuous” society by healing the souls of the people, establishing justice and guiding them towards “true happiness”.
Of course, al-Farabi realizes that such a society is rare and will require a very specific set of historical circumstances in order to be realized, which means very few societies will ever be able to attain this goal. Ignorant societies have, for whatever reason, failed to comprehend the purpose of human