Farabi, dealing with the theory of knowledge, says: science is a means of knowing the world. Sciences serve as a
means of understanding the world. Disciplines are divided into theoretical and practical. The first group is logic, natural
sciences, and metaphysics. The second is ethics and politics. Science has three main elements: a concrete subject, a convincing
argument, and evidence. It has three sources: the senses, the mind, and the muscles. With the help of the senses and the mind,
direct cognition is achieved.