Sin

The Seven Deadly Sins We should not be satisfied merely to keep the commandments of God, but should always be ready to do good deeds, even when they are not commanded. The commandments of God state the minimum requirements for salvation. They should be kept not merely according to the letter, but also according to the spirit, which obliges us to strive for greater perfection.
Actual sin is any willful thought, desire, word, action or ommission forbidden by the law of God.

PRIDE

Unrestrained appreciation of our own worth.

GREED

Immoderate desire for earthly goods.

LUST

Hankering for impure pleasures.

ANGER

Inordinate desire for revenge.

GLUTTONY

Unrestrained use of food and drink.

ENVY

Sorrow over another's good fortune.

SLOTH

Laxity in keeping the Faith and the practice of virtue, due to the effort involved.

THE FOUR SINS CRYING TO HEAVEN FOR VENGEANCE

1. Willful murder (including abortion)
   
2. The sin of Sodom.
   
3. Oppression of the poor.
   
4. Defrauding laborers of their wages.

THE SIX SINS AGAINST THE HOLY SPIRIT

1. Presumption of God's mercy.
   
2. Despair.
   
3. Impugning the known truth.
   
4. Envy at another's spiritual good.
   
5. Obstinacy in sin.
   
6. Final impenitence.

NINE WAYS OF BEING ACCESSORY TO ANOTHER'S SIN

1. By counsel.
   
2. By command.
   
3. By consent.
   
4. By provocation.
   
5. By praise or flattery.
   
6. By concealment.
   
7. By partaking.
   
8. By silence.
   
9. By defense of the ill done