Principle of the Identity of Quiddity and Existence in the Truth in Islamic Tradition and Greek Philosophy

The problem of the identity of existence and quiddity in Almighty Necessary has been referred to as the identity of existence and quiddity in the Truth in the works of Muslim philosophers and is dealt with as a philosophical principle. The great figures of Islamic philosophy have provided different interpretations of this principle and derived various consequences from it. Undoubtedly, the ideas of Greek philosophers and the teachings of Islam have played a significant role in the development of this principle by Muslim philosophers. The present paper intends to analyze the roots and origins of this principle, and it appears that a conceptual analysis of the technical terms used there could help researchers to derive better and more profound conclusions from this principle.