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.

What testimony did Christ bear concerning His relation to the law and the prophets?
What does God say the Sabbath will be to those who hallow it, or keep it holy?
What does the Bible present as the object of signing or sealing a document?
What false idea of this gathering were some to hold?
What command is given under the sixth trumpet?
When will the resurrection of the just occur?
In whom are we complete?

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