An affirmation essay is a format for writing about another author's ideas.
Some people picture philosophy entirely as a process of disagreement and refutation.
Perhaps you will even be so impressed with a philosopher's reasoning that you find your views changing accordingly. Your points of agreement with the authors you read can make an excellent basis for an essay. The purpose of an affirmation essay is for you to work with another author's point or idea that you have some agreement with, explain that idea, explain the author's reasoning, provide your reasons for agreement, and describe the significance of this point to your life and thought. It is very difficult to write about another person's work as a whole, especially with the complex works of great philosophers. The point you choose might be directly stated by the author or it might be unstated but implied.