Ask the assistance of Our Lady for our purity and holiness. As with the Rosary, no one can continually sin and pray with devotion to Our Lady for purity. Either they will give up impurity or they will give up the Three Hail Marys devotion.
Evil never gives up, nor should we in prayer.
The Three Hail Marys Devotion
O Mary through your immaculate conception, please pray for the purity of my body and the holiness of my soul.
Recite the three Hail Marys in the morning and in the evening followed by...
For the morning: O my Mother preserve me from mortal sin during this day.
For the evening: O my Mother preserve me from mortal sin during this night.
Prayer for Purity by St. Alphonsus Liquori
My God, You have given me a body to keep pure and clean and healthy for Your service and my eternal happiness. Forgive me for all my unfaithfulness in this great responsibility. Forgive me for every mean use which I have made of Your gifts in thought, word or deed since my rebirth as Your own adopted child in Baptism and my registration as a soldier of Jesus on the day of my Confirmation. Create in me a clean heart, O God, and give me a steadfast will that I may be a strength to others around me. Teach me to respect my body and the bodies of my fellow creatures. Help me to see the glory of perfect manhood In Jesus Christ and of perfect womanhood in Mary Immaculate. Inspire me with such love for the ideals for which our Savior lived and died that all my passions and energies will be caught up into the enthusiasm of His service, and evil things will lose their power. May my body be the servant of my soul, and may both body and soul be Your servants. Through Christ our Lord. Amen.
The Jesus prayer
Lord Jesus Christ, Son of God, have mercy on me, a sinner.
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"Even in the most difficult times, he who will occupy himself diligently with the Jesus Prayer will be able to be easily saved." - St Seraphim of Vyritsa
“No one can live continually in sin and continue to say the Rosary: either they will give up sin or they will give up the Rosary.” – Bishop Hugh Doyle
"Spiritual joy arises from purity of the heart and perseverance in prayer." - St. Francis of Assisi