Answer by
nuttree (1596)
Catholics classify sins as "mortal" and "venial." A mortal sin is very serious; it separates the sinner from God's grace and condemns him to Hell, unless the sin is absolved. To be mortal, a sin must involve a serious matter, and be committed knowingly and voluntarily. Divorce, blasphemy, extramarital sex, and masturbation, among others, are considered mortal sins.