When the Rosary is well said, it gives Jesus and Mary more glory and is more meritorious for the soul than any other prayer. But it is also the hardest prayer to say well and to persevere in, owing especially to the distractions which almost inevitably attend the constant repetition of the same words.
When we say the Little Office of Our Lady, or the Seven Penitential Psalms, or any prayers other than the Rosary, the variety of words and expressions keeps us alert, prevents our imagination from wandering, and so makes it easier for us to say them well. On the contrary, because of the constant repetition of the Our Father and Hail Mary in the same unvarying form, it is difficult, while saying the Rosary, not to become wearied and inclined to sleep, or to turn to other prayers that are more refreshing and less tedious. This shows that one needs much greater devotion to persevere in saying the Rosary than in saying any other prayer, even the psalter of David.
Our imagination, which is hardly still a minute, makes our task harder, and then of course there is the devil who never tires of trying to distract us and keep us from praying. To what ends does not the evil one go against us while we are engaged in saying our Rosary against him.
Being human, we easily become tired and slipshod, but the devil makes these difficulties worse when we are saying the Rosary. Before we even begin, he makes us feel bored, distracted, or exhausted; and when we have started praying, he oppresses us from all sides, and when after much difficulty and many distractions, we have finished, he whispers to us, "What you have just said is worthless. It is useless for you to say the Rosary. You had better get on with other things. It is only a waste of time to pray without paying attention to what you are saying; half-an-hour's meditation or some spiritual reading would be much better. Tomorrow, when you are not feeling so sluggish, you'll pray better; leave the rest of your Rosary till then." By tricks of this kind the devil gets us to give up the Rosary altogether or to say it less often, and we keep putting it off or change to some other devotion.
Dear friend of the Rosary Confraternity, do not listen to the devil, but be of good heart, even if your imagination has been bothering you throughout your Rosary, filling your mind with all kinds of distracting thoughts, so long as you tried your best to get rid of them as soon as you noticed them. Always remember that the best Rosary is the one with the most merit, and there is more merit in praying when it is hard than when it is easy. Prayer is all the harder when it is, naturally speaking, distasteful to the soul and is filled with those annoying little ants and flies running about in your imagination, against your will, and scarcely allowing you the time to enjoy a little peace and appreciate the beauty of what you are saying.
Even if you have to fight distractions all through your whole Rosary, be sure to fight well, arms in hand: that is to say, do not stop saying your Rosary even if it is difficult to say and you have no sensible devotion. It is a terrible battle, but one that is profitable to the faithful soul. If you put down your arms, that is, if you give up the Rosary, you will be admitting defeat and then the devil, having got what he wanted, will leave you in peace, and on the day of judgment will taunt you because of your faithlessness and lack of courage. "He who is faithful in little things will also be faithful in those that are greater." - Luke 16:10
He who is faithful in rejecting the smallest distractions when he says even the smallest prayer, will also be faithful in great things. Nothing is more certain, since the Holy Spirit has told us so.
So all of you, servants and handmaids of Jesus Christ and the Blessed Virgin, who have made up your minds to say the Rosary every day, be of good heart. Do not let the multitude of flies (as I call the distractions that make war on you during prayer) make you abandon the company of Jesus and Mary, in whose holy presence you are when saying the Rosary. In what follows I shall give you suggestions for diminishing distractions in prayer.
- from The Secret of the Rosary, bySaint Louis-Marie Grignion de Montfort