Cavalera does more than swipe a few lines as grist for the mill: He draws on the main themes of Revelation (violence, vengeance, punishment, justice, faith) and sets them to music that matches the might and majesty of St. John's prose. This is not music for the faint of heart: Soulfly unleashes brutally distorted guitars and explosive percussion, knocking one-third of the stars from heaven as guest vocalist Grady Avenell growls, "Don't fill my heart with love/engulf my heart with vengeance/you need to see our pain," and he could be addressing the man who murdered Cavalera's stepson, Dana Wells, or the God who allowed the murder to happen.
In the end, faith wins out, and the album closes with Cavalera singing, "Pressure building on my soul/I ask God to take control/Guide me through this fucked-up world," and it's the prayer of a man who has earned his faith, not blindly accepted it. It's not just heavy metal for the thinking man, it's heavy metal for the feeling man. Verily, it smites ass.