Charles Finney addresses the concept of 'Legal Religion' by emphasizing that many individuals approach their faith out of fear and self-interest rather than genuine love for God. He contrasts the legalist, who performs religious duties out of obligation and fear of punishment, with the true believer, who seeks to honor God and serve others selflessly. Finney challenges listeners to examine their motivations, urging them to move beyond a self-centered faith to one that actively seeks to rid the world of sin and promote holiness. He calls for a deeper understanding of true Christianity, which is characterized by love, self-denial, and a desire to do good for others. Ultimately, he implores his audience to determine which side they are on: the Lord's side or the side of selfishness.