It adds up.
What did you learn a year ago from your pastor. My guess is you probably don’t recall. What about six month ago, a month? Unless they said something that struck chord at that moment. But overall, most people don’t remember specifically what was said week after week.
But, like compound interest, solid teaching of biblical principles and values add up over time. If you truly listen every week, you will not be the same person a year from now.