In Catholic moral theology, mortal sin requires three conditions: grave matter (judged by Scripture, Church teaching, and reason), full knowledge (advertence of the intellect), and complete consent (consent of the will); venial sin occurs when either the matter is light or when there is incomplete knowledge or consent. Some sins like blasphemy are always mortal ex toto genere suo, while others like theft may be venial depending on circumstances.
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The Truth About Mortal and Venial Sin Every Catholic Needs to Hear Today
Added:Conditions of mortal and venial sin.
Knowledge, free will, grave matter.
Contrary to the teaching of Bañez and the reformers, a sin must be a voluntary act.
Those actions alone are properly called human or moral actions >> [music] >> which proceed from the human will deliberately acting with knowledge of the end for which it acts.
Man differs from all irrational creatures in this, precisely that he is master of his actions [music] by virtue of his reason and free will.
Since sin is a human act wanting in due rectitude, it must have, in so far as it is a human act, [music] the essential constituents of a human act.
The intellect must perceive and judge of the morality of the act, and the will must freely elect.
For a deliberate mortal sin, there must be full advertence on [music] the part of the intellect and full consent on the part of the will in [music] a grave matter.
An involuntary transgression of the law, even in a grave matter, [music] is not a formal, but a material sin.
The gravity of the matter is judged [music] from the teaching of scripture, the definitions of councils and popes, and also from reason.
Those sins are judged to be mortal which contain in themselves some grave disorder [music] in regard to God, our neighbor, ourselves, or society.
Some sins admit of no lightness of [music] matter, as for example, blasphemy, hatred of God. They are always mortal ex toto genere suo, unless rendered venial by want of full advertence on the part of the intellect [music] or full consent on the part of the will.
Other sins >> [music] >> admit lightness of matter.
They are grave sins ex genere suo inasmuch as their matter in itself [music] is sufficient to constitute a grave sin without the addition of any other matter, but is of such a nature that in a given case, owing to its smallness, the sin may be venial, for example, theft.
Conditions for venial sin.
Venial sin is committed when the matter of the sin is light, even though the advertence of the intellect and consent of the will are full [music] and deliberate. And when, even though the matter of the sin be grave, there is not full advertence [music] on the part of the intellect and full consent on the part of the will.
A precept obliges sub gravi under grave matter when it has for its object an important [music] end to be attained and its transgression is prohibited under penalty of losing God's friendship.
A precept obliges sub levi under light [music] when it is not so directly imposed.
God bless you.
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