See this legally free ebook:

  • The Authority of the Church, an excerpt from The Catholic Controversy, by Saint Francis de Sales, translated by Rev. Henry Benedict Mackey, O.S.B. (London: Burns and Oates, 1886). May be read online at Catholic Apologetics Information. [Caution. When searching for other texts on the site, which has useful apologetical materials in relation to non-Catholic errors, readers without adequate theological formation are advised avoid its materials on the Second Vatican Council, which it deems invalid on the basis of an invalid hermeneutic of discontinuity.] 

On the feast of St. Francis De Sales in the Extraordinary Form of 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). Blessed be God in His angels and in His saints!