From Professor Art Carden (from a long time ago, but I never got around to posting it):
One of the popular myths of higher education is that professors are sadists who live to inflict psychological trauma on undergraduates. Perhaps you believe that we pick students at random and then schedule all our assignments in such a way as to make those students’ lives as difficult as possible. The older I get and the longer I do this, the more I recognize that we (the professors) need to be more transparent about our philosophies of evaluation.
...
...the burden of proof is on you to demonstrate that you have mastered the material. It is not on me to demonstrate that you have not. My assumption at the beginning of each class is that you know somewhere between nothing and very little about basic economics unless you were lucky enough to have an exceptional high school economics course. Otherwise, why are you here?
That said, you should never take grades personally. I don’t think you’re stupid because you tank an exam, an assignment, or even an entire course. Economics is hard. A D or an F on an economics exam does not diminish your value in God’s eyes (or in mine) or indicate that economics just isn’t for you. It probably means you need to work smarter, and I’m here to help you with that.