Both Pharyngula and Aetiology already linked to this, but it's so true...here's a sample with some of my personal favorites highlighted):
So who am I? I'm tenacious. I can be ground down but never stopped. Repeated setbacks fuel my desire to overcome an obstacle and solve the problem. I am calculating; after dusting myself off, I plan a new approach before trying again. I show up to work every day because ultimately my job gives me a chance to improve lives. It isn't about money but the excitement of discovering something completely new and the prospect of alleviating human suffering. Sure I can withdraw into my work, oblivious to the world around me. But isn't that a good thing? Lives are improved by informed experts who fully immerse themselves in a problem. Does that make me arrogant? Maybe. Any headstrong person who speaks with well-earned authority can labeled "arrogant". Force-of-will is what it takes to succeed in this racket and to foster progress. And that is a good trait to have. Problems only get solved when tackled head-on.
I'm not satisfied with quick non-answers to hard questions. I possess both righteous indignation and humility in the face of ignorance. I reject the idea that religiosity automatically makes someone an expert on anything, especially matters of science. And I just might know what the hell I'm talking about. Who the hell do I think I am, spouting such arrogant, highbrow bullshit?
Back off man. I'm a scientist.