Chapter 1 — Preface to the Roman Catechism
Section 25. How This Work Is To Be Used — We therefore deem it proper to inform pastors that, whenever they have occasion, in the ordinary discharge of their duty, to expound any passage of the Gospel or any other part of Holy Scripture. they will find its subject-matter treated under some one of the four heads already enumerated, to which they recur, as to the source from which their instruction is to be drawn.