1. In the Library of Alexandria, These words were written - "Sciencia Potentia Est" which translates in English as "Knowledge is Power". The modern civilization would never exist if it was not for the accumulation of specific information on a wide range of topics over thousands of years and studying the same over generations that came afterwards.
2. Studying about something itself is a very engaging process. It enables thinking deep about a topic while also learning new things.
3. It takes away boredom. An empty mind is the factory of the evil. Without something productive to think about, The mind cooks up bad things which leads to crime because the mind's processor i. E. The central nervous system has to process something always (Unless you're sleeping).