Kind words from friends; getting there in time to save a structure; making a positive difference in someone's life; seeing the 'light' go on in a student's eyes. Realizing that not all people are kind or even well-mannered, but that it takes all kinds to make a world, and their attitudes don't have to be mine. The fraternity at the end of a long accident scene when the patient is in the ambulance and gone, when the trucks are washed and 'put to bed'. When I know in my heart that I have given my best. Stuff like that.