Mortification of Sin is a book by the English theologian John Owen in which he discusses human's unceasing battle against the immorality in them. Owen argues that a believing Christian can't win in this battle on his own, using his strength. He believes that the only way this battle can be won is with the help of God and through the sheer faith. Owen presents convincing case for the importance of mortification establishing some basic and iconic verities concerning the significance of sin in believers and provides answers and instructions on how can these issues can be dealt with the power of the Spirit and through faith in Christ.