Re-reading Art and Fear last night I was reminded about development. When an artist is younger he/she experiments with lots of different technology and ideas but as time goes by and certain approaches, styles and tools emerge more prominently than others then experimentation turns into expression.
The art of leadership is no different. When I was younger I tried a variety of approaches, searching for the right combination of values to guide me. (i.e. relational, hierarchical, choleric, sanguine, etc...) Age and repetition increasingly remind what my style is, what my strengths are, the concepts I'm most comfortable with and what I'm most effective at. Experimenting turns into expressing.
From a biblical perspective wisdom has less to do with knowledge and more to do with application of knowledge. I think expressing is the application of knowledge. So, if you're a young leader (or young anything) and you want to get better at what you do, you really only have one option: keep doing it over and over and over.