You decide medicine is the profession for you. You begin work with a professor at the Academy named Hippocrates. The two of you begin working on a theory that diseases are caused naturally by the body and not by spirits as is the common belief at the time. You're constantly being criticized for your work and get a lot og grief from the educated of the day.
However, you keep believing that you are right and working on the theory. As your proof begins to increase, you start bringing others into your camp of believers. Your work becomes more popular and you're starting to become somewhat famous for your work. Eventually, your work becomes the basis for all modern medicine. You feel you've made a real contribution to society.