The Corporate Pursuit and Oversight [Hebrews 12:14-17]

Is Hebrews 12:14 speaking about personal or corporate pursuit of peace and holiness? What kind of bitterness is the author addressing here? What is the point of the author in speaking about sexual immorality, which seems to have no connection to the context? What is the responsibility of believers in the church? This sermon addresses some complex issues of the text with encouraging applications to believers.