Essays are for topics that take a little longer to cover than a normal post or page, but are not nearly as long as a book. This particular series of 21 essays discusses various implications of the truth that Everyone Is Going to Heaven. These implications include the consequences of our actions and the importance of our motives. It concludes with the imperative that we repent. Note, however, that we do not repent in order to go to heaven. Rather, we repent because we are going to heaven. God is gracious and this is the reponse we owe Him.
There is a logical flow if you read these essays sequentially. However, there is nothing wrong with reading them in any order you choose.