In: Stephen Keenan, A Doctrinal Catechism, 3rd edition, Chapter 2, p174

“Question: Have you any other way of proving that the church has power to institute festivals of precept?

“Answer: Had she not such power, she could not have done that in which all modern religionists agree with her; -she could not have substituted the observance of Sunday the first day of the week, for the observance of Saturday the seventh day of the week, a change for which there is no Scriptural authority.”

In: An Abridgment of the Christian Doctrine, Rev. Henry Tuberville, D.D. (R.C.), (1833), p58

Question: How prove you that the church had power to command feasts and holydays?

Answer: By the very act of changing the Sabbath into Sunday, which Protestants allow of and therefore they fondly contradict themselves by keeping Sunday strictly, and breaking most other feasts commanded by the same church.

In: Monsignor Louis Segur, Plain Talk about the Protestantism of Today, p2l3

"We observe Sunday Instead of Saturday because the Catholic Church transferred the solemnity from Saturday to Sunday."

In: Albert Smith, chancellor of the Archdiocese of Baltimore, replying for the Cardinal in a

 letter, February 10, 1920.

"It was the Catholic Church which, by the authority of Jesus Christ, has transferred this rest (from the Bible Sabbath) to the Sunday. . .Thus the observance of Sunday by the Protestants is an homage they pay, in spite of themselves, to the authority of the (Catholic) Church."

In: Peter Geiermann, CSSR, A Doctrinal Catechism, 1957 edition, p50

“Question: Which day is the Sabbath?”

“Answer: Saturday is the Sabbath.”

“Question: Why do we observe Sunday instead of Saturday?”

“Answer: We observe Sunday instead of Saturday because the Catholic Church in the Council of Laodicea (A.D. 336) transferred the solemnity from Saturday to Sunday.”

In: Catechism of the Council of Trent, 1545-1563, p 402, second revised edition (English),

1937.  (First published in 1566)

"The Church of God has thought it well to transfer the celebration and observance of the Sabbath to Sunday"

In: The Catholic Christian Instructed in the Sacraments, Sacrifices, Ceremonies, and

Observances of the Church By Way of Question and Answer, RT Rev. Dr. Challoner, p204

"Q. Has the [Catholic] church power to make any alterations in the commandments of God?"

"A. ...Instead of the seventh day, and other festivals appointed by the old law, the church has prescribed the Sundays and holy days to be set apart for God’s worship; and these we are now obliged to keep in consequence of God’s commandment, instead of the ancient Sabbath."