Passive learning .... reading a book, listening to a lecture, watching a movie ... is slow and inefficient. It's a waste of valuable time.
Active learning .... responding to questions, summarizing information, discovering relationships between facts, applying knowledge, teaching others ... is fast and efficient.
If you want to learn something: interact with it!
Our job as educators is to teach you how to interact with the subjects we teach, and to provide opportunities for you to do so.