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.

By what principle is genuine faith actuated?
What prophetic declaration foretold this truth?
Through Christ, what has been opened to the house of David?
What call was made to come out of Babylon?
What was the Lord's covenant which they were to keep as their part of this covenant?
How does God regard the afflicted?
What therefore follows?

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