A two-fold goal could be:
1. personal learning and growth
2. sharing what is learned with others
It is not about building personal treasuries of knowledge (hoarding for oneself), but it is always geared toward sharing what is learned with others.
It might be a natural thing for all people to want to learn and grow and then share what is learned (as in simply being a human being means a person learns and shares).
Or it might come from a personal bent and joy in encouraging and teaching (as in something God has placed the desire and ability in a person to do).
Or it might just be a good skill that can (and perhaps should) be learned - to ultimately make learning focus our lives on others.