Prop's to Scott August for an excellent series of posts on his website about playing from the heart. Scott has put together a class which he just presented at the Zion Flute Festival. The posts include content from his class. To check it out, follow these links:
Playing from the Heart Part 1
Playing from the Heart Part 2
While you're there, be sure to check out Scott's music, he's one of the best composers (still) living on the planet (in my honest opinion)...
Also, be sure to read Scott's Blog.