Chapter 33 — Part IV: Prayer — On Prayer in General
Section 3. Necessity of Prayer — In the first place the necessity of prayer should be insisted upon. Prayer is a duty not only recommended by way of counsel, but also commanded by obligatory precept. Christ the Lord declared this when He said: We should pray always. This necessity of prayer the Church points out in the prelude, if we may so call it, which she prefixes to the Lord's Prayer: Admonished by salutary precepts, and taught by divine instruction, we presume to say, etc.