Definition: - **sola** scriptura (by scripture alone): scripture is the **supreme** authority, and is sufficient. - **solo** scriptura (scripture alone): scripture is the **only** authority. Cardinal Gibbons's argument is that: - All Catholic and Protestant denominations sanctify Sunday, treating it as a day of rest and worship. This is the most obvious of all sacred duties. Violating the "Lord's Day" is considered a sin. - The Bible does not sanctify Sunday, only the seventh day sabbath. - Therefore all denominations recognize a non-biblical truth as doctrine. - Therefore: - the concept of solo scriptura cannot be valid, because this doctrine comes from a non-biblical authority. - The concept of sola scriptura cannot be valid, because this doctrine means that the Bible isn't sufficient. > A rule of Faith, or a competent guide to heaven, must be able to instruct in all the truths necessary for salvation. Now **the Scriptures alone do not contain all the truths which a Christian is bound to believe**, nor do they explicitly enjoin all the duties which he is obliged to practice. Not to mention other examples, is not every Christian obliged to sanctify Sunday, and to abstain on that day from unnecessary servile work? Is not the observance of this law among the most prominent of our sacred duties? But **you may read the Bible from Genesis to Revelation, and you will not find a single line authorizing the sanctification of Sunday**. The Scriptures enforce the religious observance of Saturday, a day which we never sanctify. **The Catholic Church correctly teaches that our Lord and His Apostles inculcated certain important duties of religion which are not recorded by the inspired writers**. > > — James Cardinal Gibbons, [*The Faith of Our Fathers*](https://books.google.ca/books/about/The_Faith_of_Our_Fathers.html?id=xS03AAAAMAAJ&printsec=frontcover&source=kp_read_button&hl=en&redir_esc=y#v=onepage&q=3c&f=false) , p.111 How do denominations that believe in solo scriptura or sola scriptura respond to this argument? --- Some comments say Sunday isn't a doctrine. [Westminster Larger Catechism (1648)](https://fpcna.org/beliefs/wlc/) for instance says that not honoring the the sabbath is a **sin**. If that isn't doctrine, what is? > Question 119: What are the sins forbidden in the fourth commandment? Answer: The sins forbidden in the fourth commandment are, all omissions of the duties required, all careless, negligent, and unprofitable performing of them, and being weary of them; all profaning the day by idleness, and doing that which is in itself sinful; and by all needless works, words, and thoughts, about our worldly employments and recreations.