According to the document Scientific and Cultural Trends in Iran From Achaemenids until the End of Safavids by Estiphan Panoussi
 
This work presents a sweeping historical study of Iran’s intellectual, scientific, linguistic, and cultural development from the Achaemenid Empire (6th century BCE) through the Safavid period (17th century CE).
 
Core Thesis
 
The book argues for the continuity and outward influence of Iranian civilization, showing that Iran was not merely a recipient of external ideas (Greek, Indian, Islamic), but a major transmitter and transformer of knowledge across Eurasia.