What do Catholics say of the observance of Sunday by Protestants?

Answer

"It was the Catholic Church which, by the authority of Jesus Christ, has transferred this rest to the Sunday
in remembrance of the resurrection of our Lord. Thus the observance of Sunday by the Protestants is an
homage they pay, in spite of themselves, to the authority of the [Catholic] church. "-"Plain Talk About the
Protestantism of Today," by Mgr. Segur, page 213.

For what purpose were the Scriptures written?
16. How did Christ reprove those who, though familiar with the letter of the Scriptures, failed to understand them?
What will follow this union with Christ in His death and resurrection?
When did the priest minister in the first apartment of the sanctuary?
What did ancient Babylon do to all the nations?
How did Jesus answer them?
6. What would have been the result to the dead had not Christ procured their release from the grave?

Questions & Answers are from the book Bible Readings for the Home Circle