Satan is trying to limit you saying the Holy Rosary because he knows that praying the Holy Rosary limits him and puts his at a very great disadvantage.
One day when Blessed Alan was saying Mass, Our Lord, Who wished to spur him on to preach the Holy Rosary, spoke to him in the Sacred Host: “How can you crucify Me again so soon?” Jesus said. “What did you say, Lord?” asked Blessed Alan, horrified. “You crucified Me once before by your sins,” answered Jesus, “and I would willingly be crucified again rather than have My Father offended by the sins you used to commit. You are crucifying Me again now because you have all the learning and understanding that you need to preach My Mother’s Rosary, and you are not doing so. If you only did this you could teach many souls the right path and lead them away from sin - but you are not doing so and so you yourself are guilty of the sins that they commit.” This terrible reproach made Blessed Alan solemnly resolve to preach the Rosary unceasingly.
— St. Louis Marie de Montfort