The Rosary helps Reason to choose the Truth

The repetitive, meditative prayer of the Rosary, focusing on Jesus's life through Mary, clears the mind, increases intuition, promotes discernment (knowing right from wrong), and opens one to a "Higher Truth," leading to a deeper understanding of God and guiding one away from sin toward goodness and spiritual clarity. It's seen as a tool for spiritual discipline that aligns one's will with God's will, making it easier to choose truth over falsehood. 
 

How the Rosary Cultivates Truth-Seeking:

Spiritual Discernment: By meditating on the Mysteries (events in Jesus's life), individuals develop a better ability to distinguish good from evil and understand God's will.
    

Clarity & Peace: The practice fosters inner peace and mental clarity, reducing worldly distractions that obscure truth.
    

Focus on Higher Purpose: It directs focus from earthly desires towards heavenly treasures and God's glory, helping one see the ultimate truth.
    

Intuition & Grace: Regular recitation  increase intuition and open the mind to divine revelation, helping one accept God's truth.
    

Overcoming Sin: By strengthening the will and fostering a desire for goodness, it helps overcome temptation and sin, which are often seen as the root of choosing error. 
 

Intercession for Discernment: Saints like St. Louis de Montfort emphasized that praying the Rosary devoutly is a way to obtain the "light of God" for the purpose of "knowing the truth". This divine light assists human reason in making choices that align with eternal reality rather than worldly vanities. 

Rosary functions by engaging the human intellect in meditation while opening the soul to divine revelation. 
Here is how the Rosary helps Reason choose the Truth:
    

Illuminating the Intellect through Meditation: The Rosary is often called a "contemplative catechism". By meditating on the 20 Mysteries—key events in the life of Jesus and Mary—the mind is focused on historical and spiritual truths of the Gospel. This repetition calms superficial distractions, allowing Reason to dive deeper into "the genius of God's plan".
    

A Weapon against Error: One of the traditional "15 Promises of the Rosary" is that it will "defeat heresies". Historically, the Rosary was promoted by St. Dominic to combat the Albigensian heresy, serving as a means to teach the true nature of Christ to those who were intellectually misled.
    

Aligning the Will with Divine Truth: Regular recitation is said to "purify our souls" and "wash away sin," which are often the obstacles that prevent human Reason from recognizing the Truth. By purifying the heart, the Rosary helps the individual see their life through a "shared perspective with God".