> just pick something and go for it. Do it well - be excellent.

It's funny that another Jack Black movie, "The School of Rock" (2003), has a similar message: Do what you love because you love it. Even if you are not very good at it, you can find a way to fit it into your life. https://moviewise.wordpress.com/2013/03/05/the-school-of-roc...

Another movie that shows this lesson is the 2013 documentary "Salinger": Be driven by making your work great, not by the reactions of others. https://moviewise.wordpress.com/2015/08/03/salinger/

Which is influenced by Hinduism, "you should do your work as perfectly as you possibly can with no thought of rewards, and only that way can you be a really happy person.”