Ahura Mazda and it was based on these ideas of good thoughts lead to good words and good deeds. Other big ideas of the Persian Empire is their system of governance. Because it was such a vast empire, they delegated the emperor, the Shahanshah, the king of kings, delegated authority to the regions. So each region, each satrapy had its governor called a satrap and as we see over time, some of these satraps got more power than maybe was intended and then eventually took over but this was a major empire in the history of the world. They unified people. They're famous for the royal road that connected Sardis all the way to Susa. As you can imagine, it would have facilitated the transfer of knowledge and the transfer of trade.