Roman Catechism 34.35

Chapter 34 — Part IV: Prayer — The Lord's Prayer: Introduction and Our Father Who Art in Heaven

Section 35. Filial Confidence And Piety — Do not, then, forget, oh Christian, that when about to address this prayer to God, you ought to approach Him as a son to his Father; and hence in beginning your prayers and in pronouncing the words Our Father you should consider the rank to which God in His goodness has raised you when He commands you to fly to Him, not as a timid and fearful servant to his master, but willingly and confidently, like a child to its father.