In any essay, there are several steps to follow in writing a conclusion. First of all, you need to look at your thesis. A thesis should be a specific, clear, well-explained sentence that tells the reader exactly what you are trying to prove. Your conclusion should contain the same thesis that was in your introduction. You can word it slightly differently, but the same ideas should be there.
You will also want to be sure to include a quick review of your arguments. If your essay is about one argument explained three ways, you need to review those ways. I always like to end with some kind of concluding thought, especially in a philosophy essay. You should leave your reader thinking.