Roman Catechism 34.32

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

Section 32. Though there are in the Church of God various gradations of office, yet this diversity of dignity and position in no way destroys the bond of fraternal union; just as in the human body the various uses and different functions of our organs in no way cause this or that part of the body to lose the name or office of an organ of the body.