Why was reading Helen Keller's favorite subject?

Despite being both deaf and blind, Helen Keller was taught by Anne Sullivan to read braille at a young age. Reading became a practical benefit and a lifelong passion for Keller, who would go on to advocate for education for the blind for the rest of her life. 

Helen Keller was widely regarded as a determined individual by her family and colleagues, so the fact that no one believed she would ever be able to read was likely a major reason she was so passionate about it. After being largely separated from the world around her, gaining the ability to read introduced Keller to a world of stories, people and experiences she had never imagined before.

Keller noted that she loved to read anything she could find in braille when she was younger, but as she grew and obtained more education, the topics of politics and world events became her favorite to read about. Some of her favorite books included volumes of poetry and philosophical texts. She was also a talented student of languages and enjoyed reading foreign language books in French, Latin and German.