Everyone who is Catholic or of the Christian or Jewish faith should know about The Ten Commandments, but you should also know that there are 5 additional commandments of the Church. The 5 additional commandments state:
1. You shall attend Mass on Sundays and on holy days of obligation.
2. You shall confess your sins at least once a year.
3. You shall receive the sacrament of the Eucharist at least once during the Easter season.
4. You shall observe the days of fasting and abstinence established by the Church.
5. You shall help to provide for the needs of the Church.
The reasons for these additional commandments are, and I quote: ‘The most obvious reason for the Church commandments is Church authority, which has a right to be obeyed as delegated by Our Lord, which common tradition subsumes under the Fourth Commandment. The first Church Commandment is obviously an explanation of the minimum requirements for allowing the Lord’s Day, with the specification that it is Mass, and not anything else, that needs to be heard, that the Lord’s Day has been shifted from Saturday to Sunday, and that some other feasts are assigned by Church authority in remembrance of Our Lord, of His blessed Mother and of the Saints. The third Church Commandment is a specification to Our Lord’s directive to eat His Flesh, reducible to the Third Commandment as well since it is an act of devotion. The second Church Commandment prescribes a preparation for fulfilling the third Church Commandment and was promulgated at the Fourth Council of the Lateran. What concerns the fourth Church Commandment, the Church believes that penance is of divine law, and the notion is general that fasting, as a penitential practice, is quite useful, citing such Scripture as “Be converted to Me with all your heart, in fasting”. Thus again, the commanding act of the Church rather consists in the precisation. The necessity of providing for the needs of the Church results from the faithful belonging to one Mystical Body and is regulated in canons 1260 and 1262.’
All information has been provided by Mr. Sader from Wikipedia