Roman Catechism 36.10

Chapter 36 — Part IV: Prayer — The Second Petition: Thy Kingdom Come

Section 10. But unhappy man is guilty of frequent falls. Seldom does he carry out his good resolutions; often he abandons and despises what he has well commenced; his best purposes which pleased for a time, are often suddenly abandoned, and he plunges into designs as degrading as they are pernicious.