Glory

 
They're hard to write, but oh-so-wonderful to receive. (Source)

You save lives. Happy patients write thank you letters. You get to see young patients grow up. Numerous neurosurgeons actually cover their walls with their thank you cards. Nothing like an ego boost when you walk into the office every day.

The glory is also in discovering new treatments for life-threatening diseases like glioblastoma, which killed U.S. Senator Edward Kennedy. The survival rate for glioblastoma of the brain is one percent. Cancer specialists and neurosurgeons have started testing a new brain cancer vaccine that helps the body attack the disease. If Phase III is successful, the FDA could approve the drug in four years. Talk about glory.