Vain repetition in the manner of heathens is forbidden, but not useful repetition which is not in the manner of heathens. Vain repetition relies mechanically upon the mere number of prayers or formulas uttered. But Catholics do not rely on the mere repetition of prayers, nor upon their multiplication, but on the intrinsic worth of each prayer and upon the fervor and earnestness with which it is said. Two prayers said well, one immediately after the other, are as good as the same two prayers said well with twenty-four hours between them. Time is nothing to God, in whose sight 1000 years are but as a day. He does not mind whether there be two seconds between our prayers or two years; the prayers themselves are just as pleasing to Him. If you take the principle behind your objection, and push it to its full conclusion, you could say the Our Father but once in your life. If you said it once each year, it would be repetition. How often may you say it? Once a month? Once a week? Once a day? If daily, what would be wrong with saying it hourly? If you have just concluded one Our Father, why may you not begin it again at once? Does it suddenly become an evil prayer?
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty