Chapter 33 — Part IV: Prayer — On Prayer in General
Section 7. Those, therefore, who do not practice assiduous and regular prayer deprive themselves of a powerful means of obtaining gifts of singular value. To succeed in obtaining the object of your desires, it is not enough that you ask that which is good; your entreaties must also be assiduous. Every one that asketh, says St. Jerome, receiveth, as it is written. If, therefore, it is not given you, this is because you do not ask. Ask, therefore, and you shall receive.