Good pastors must imitate the Good Shepherd and warn their sheep of ravenous wolves. When Cain murdered his brother, Abel, God said, “What have you done? The voice of your brother’s blood is crying to me from the ground” (Gen. 4:10).

Particular mortal sins are so evil that they are said to be sins that cry to heaven for vengeance: homicide (Gen. 4:10), sodomy (Gen. 18:20-21), oppression of widows and orphans (Exod. 2:23), and defrauding workers of their just wages (Jas. 5:4).

Sins against the Holy Spirit are mortal sins that harden a soul by rejecting the Holy Spirit: despair, presumption, envy, obstinacy in sin, final impenitence, and deliberate resistance to the known truth