When these four substances are intermingled in a proportionate manner, things are created.15 These primary substances are everlasting and unperishable. He also explained how things come into being and then perishes. He said that there are two forces operating in this world, love and strife. By love, primary substances are brought together and thus things are formed and by strife they are disintegrated into original substances. He was of the view that primary substances are innumerable.
Every substance contains a portion of other substances.
According to this notion, the concept of life and death has no real meaning. It is an arrangement of elements in a particular order and the disintegration of these elements is termed death. Anaxagoras was the first Greek physician who put forth the idea that mind, a non-physical entity, played very important role in the creation of the universe. It enters into the composition of all living things and distinguishes them from dead matter. The concept of matter in Unani medicine has been constantly changing as described in the foregoing pages.