Explain how the play supports the idea that knowledge of one’s sin is necessary before one can truly repent.

One way of looking at the play and Everyman's forsaking friends is by grouping them according to the seven deadly sins. It's certainly true that each sin could be found in the play, but sin itself is a wider theme in the play: Everyman must first understand his sin and then absolve himself of sin to go to heaven. God is furious that humans are living a superficial life on earth, focusing on wealth and riches, without worrying about the greater judgment that is to come - and, notably, Everyman's own judgment - his ability to understand his life - becomes gradually more and more enlightened on his pilgrimage towards his heavenly reward.