Mission and Vision

I am starting to figure out my mission – what I am here in this job to do and what I am here on earth to do. However, I am learning that vision is essential as well. Who do I want to be? How does my futuristic vision for myself determine what my purpose and mission are? Since my vision for myself involves being a thought leader, my mission must involve teaching or leading, for example. Who I want to be must match what I want to do.