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.

In what language did Isaiah foretell Christ's birth?
How complete is the salvation obtained in Christ?
How is justification laid hold upon?
19. Upon returning from a feast at Jerusalem how came Joseph and Mary to lose Jesus when He was twelve years old?
When did this long period expire?
What will this power propose that the people shall do?
Concerning what did Christ tell us not to marvel?

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