The First Commandment: I am the Lord your God, you shall have no other Gods before me.
Participating in the occult (fortune-tellers, palm readers, etc.), failing to give 10% of one’s income to the poor and the Church when not in a state extreme financial distress, leaving the Catholic Church for another faith because of personal preferences.
The Second Commandment: You shall not take the name of the Lord in vain
Using God’s name as curse. Appealing to religious motivation in order to defend something that is not clearly God’s will. Using the holy name of God or one of His titles in a light way. Speaking with profane and vulgar language. Receiving Holy Communion or another sacrament in a state of mortal sin.
The Third Commandment: Keep holy the Lord’s Day
Missing Mass on a Sunday or Holy day without a very serious reason (like illness). Doing unnecessary servile work on Sunday. Spending Sunday (apart from Mass) exclusively focusing on sports and entertainment rather than prayer and religious reading. Neglecting daily prayers and continuing education in the faith. Leaving Mass early/deliberately arriving late.
The Fourth Commandment: Honor your father and mother
(For a minor) Disobeying one’s parents in a serious matter. Neglecting the emotional and financial support of one’s parents in old age. Disobeying legitimate Church authority. Willfully rejecting an article of the divine and Catholic faith. Disrespecting one’s parents. Speaking badly of priests and consecrated persons. Breaking traffic laws and other non-criminal and criminal laws that are not contrary to reason.
The Fifth Commandment: You shall not murder
Deliberately taking or assisting in taking an innocent human life (including abortion). Using the morning after pill. Consuming alcohol to the point of the loss of the use of reason. Taking illegal drugs. Driving recklessly or under the influence. Driving distractedly or over the speed limit. Having unhealthy eating/drinking/smoking habits. *Striking without provocation or bullying (consult a priest about the seriousness of these sins).
The Sixth Commandment: You shall not commit impure actions
Having intercourse outside of marriage. Committing impure actions with oneself. *Practicing contraception or interruption. Engaging in impure actions with others.
The Seventh Commandment: You shall not steal
Cheating on one’s taxes. Stealing another’s possessions (when the quantity is significant). Defrauding one’s employer or business associates. (If an employer) Failing to pay a just wage.
The Eighth Commandment: You shall not bear false witness
Lying about another so as to do serious damage his reputation. “White” lies. Giving false evidence under oath. Exposing the faults of others to those who cannot correct them in an attempt to do harm to their reputations. Failing to maintain a confidence in a serious matter.
The Ninth Commandment: You shall not covet your neighbor’s spouse
Viewing or reading pornography. Consenting fully and freely to unchaste thoughts. Deliberately dressing in such a way as to incite lust in others. Engaging in conversations calculated t0 incite lust.
*The Tenth Commandment: You shall not covet your neighbor’s goods:
Withholding forgiveness, wishing one’s neighbor ill, choosing to be saddened by another’s good fortune. Acting in a violent or angry way toward others. Seeking revenge.