Define yourself by your cause not your craft.
Finally had a chance to watch this and it just blew me away. Love the message:
If you find your guiding principal, you can fight for a cause.
For more on Bret, see http://worrydream.com.
Bret Victor - Inventing on Principle (by CUSEC)
Bret Victor invents tools that enable people to understand and create. He has designed experimental UI concepts at Apple, interactive data graphics for Al Gore, and musical instruments at Alesis.