Roman Catechism 40.15

Chapter 40 — Part IV: Prayer — The Sixth Petition: Lead Us Not into Temptation

Section 15. But those who have dedicated themselves to God, leading a heavenly life upon earth, are the chief objects of the assaults of Satan. Against them he harbours bitterest hatred, laying snares for them each moment. Sacred Scripture is full of examples of holy men who, in spite of their firmness and resolution, were perverted by his violence or fraud. Adam, David, Solomon and others, whom it would be tedious to enumerate, experienced the violent and crafty cunning of demons, which neither human prudence nor human strength can overcome.