Well known Saints testify to the power and importance of the Rosary.
"The 'Hail Mary' said well is the force that puts the devil to flight." ~ St. Louis de Montfort
"The Rosary represents a symbol of Mary's graces. Christians invoke Her as 'Queen of the Most Holy Rosary,' which conjures up the brilliant conquests of faith over evil and over religious ignorance." ~ Pope Pius XII
"The Rosary in particular is a sign of predestination. Our fidelity in reciting it is a sure sign of salvation." ~ Bd. Alan de la Roche
"When we speak the name of Mary, Heaven becomes more beautiful and earth rejoices. The demons are terrified and vanish like dust in the wind." ~ St. Francis of Assisi
"To become perfect, say a Rosary a day." ~ St. Louis de Montfort