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.

Through what instrumentality is conversion wrought?
By his works what was shown to be perfect?
22. In what announcement in the New Testament is the establishment of the kingdom of God made known?
Whom are all called upon to worship?
How, then, did the Lord prove the people (verse 4) whether they would keep His law, or not?
How long did he continue this work there?
What wonderful demonstration will accompany the Lord's coming?

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