The principles behind Catholic Sunday worship are based on these scriptures:
(a) Exodus 20:8-10, Deuteronomy 5:12-15
(b) upon Jesus’ teachings regarding the sabbath.
In speaking of the sabbath, Scripture recalls creation:
1, “The seventh day is a sabbath of solemn rest, holy to the Lord” [Exodus 31:15]
2, It commemorates God’s mercy in the liberation from slavery (in Egypt, but symbolically our liberation from the slavery of sin);
3, and it is a sign of the covernant between God and His people.
2173 The Gospel reports many incidents when Jesus was accused of violating the sabbath law. But Jesus never fails to respect the holiness of this day [Mark1:21; John 9:16]
He gives this law its authentic and authoritative interpretation: The sabbath was made for man, not man for the sabbath. [Mark 2:27]
With compassion, Christ declares the sabbath for doing good rather than harm…[Mark 3:4]
The sabbath is the day of the Lord of mercies and a day to honor God [Matthew 12:5; John 7:23 “The Son of Man is lord even of the sabbath” [Mark 2:28]
Bryan, I guess this perception of mercy towards others and ourselves as an important aspect of our sabbath worship is grounded also in Matthew 25, verses 31-46, part of which follows:
“The Last Judgement”
"When the Son of Man comes in all His glory, escorted by all the angels, then he will take his seat on his throne of glory. All the nations will be assembled before him and he will separate men from one another as the shepherd separates sheep from goats.
He will place the sheep on his right hand and the goats on his left. then the King shall say to those on his right hand," Come you whom my Father has blessed, take for your heritage the kingdom prepared for you since the foundation of the world. For I was hungry and you gave me food; I was a stranger and you made me welcome. I was thristy and you gave me drink; I was a stranger and you made me welcome; naked and you clothed me; sick and you visited me, in prison and you came to see me.
Then the virtuous will say to him in reply, “Lord, when did we see you hungry and feed you; or thirsty and give you drink? When did we see you hungry and feed you; or thirsty and give you drink? When did we see you a stranger and make you welcome; naked and clothe you; sick or in prison and go to see you?
And the King will answer, " I tell you solemnly, in so far as you did this to one of the least of these brothers of mine, you did it to me.” [Matthew 25 31-40]
While the Church can be very precise in its doctrines and canons, you may have observed that the Church does leave some aspects open to the authentic charitable interpretation of the individual, so that in such instances as these a person is free to apply the principles as best they can within the guidelines.
God bless you, Trishie