Al-Biruni was not interested in treasure. When the Sultan returned from his raids, Al-Biruni asked only for one thing:
Al-Biruni smiled. "A mirror does not judge the face it reflects. It simply shows it clearly. If I only see them through my own eyes, I will write a book of my own prejudices. I want to write a book of their truth." kitab al hind
Once he understood the language, Al-Biruni began writing. He did not write to praise or to condemn India. He wrote to describe it. He used a brilliant method: he would explain a Hindu idea, then immediately compare it to a similar idea from Greek philosophy or Islamic science. Al-Biruni was not interested in treasure