The Lord’s Day…was taken as a celebration of the three great events of salvation history. It was first of all the day of the resurrection of the Lord and therefore the beginning of the new creation. It was also the very first day of the first creation, and therefore a time to rejoice in the goodness of God’s bounty. And it was the eighth day of the week, and therefore a day of hope pointing to the consummation of all things.
– Justo Gonzalez in A Brief History of Sunday