See this online ebook:

  • The Externals of the Catholic Church: Her Government, Ceremonies, Festivals, Sacramentals, and Devotions, by Rev. John Francis Sullivan (New York: P. J. Kenedy & Sons, 1917). With Imprimatur. May be read online or downloaded in multiple formats at Internet Archive and Open Library. The 2nd edition, revised to conform to the new code of canon law, may be read online or downloaded in multiple formats at Open Library.

See also the following relevant works previously indexed in the Project:

On the Feast of the Chair of Saint Peter in the Roman Rite. For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).

The scribes and the Pharisees have sitten on the chair of Moses. All things therefore whatsoever they shall say to you, observe and do: but according to their works do ye not; for they say, and do not.” (St. Matthew xxiii, 2-3 DRB)

“[T]he reason he first said ‘The scribes and pharisees sit upon the chair of Moses’ was so that what he then added, viz., ‘Do everything and observe everything they tell you,’ might be understood to apply to those things which pertain to that chair. However, things which are contrary to the faith or to good morals do not pertain to that chair.” (St. Thomas AquinasQuodlibet 3.4.2)