Roman Catechism 37.36

Chapter 37 — Part IV: Prayer — The Third Petition: Thy Will Be Done on Earth as It Is in Heaven

Section 36. A Sense Of Our Own Weakness Of Will — To close our exposition of this Petition we must revert to a subject at which we glanced in the beginning. It is that the faithful in uttering this Petition should be humble and lowly in spirit: keeping in view the violence of their inborn passions which revolt against the will of God; recollecting that in this duty (of obedience) man is excelled by all other creatures, of whom it is written: All things serve thee; and reflecting, that he who is unable without divine help to undertake, not to say, perform, anything acceptable to God, must be very weak indeed.