9 And truly, from the frequent meditation on the Mysteries, the soul little by little and imperceptibly draws and absorbs the virtues they contain, and is wondrously enkindled with a longing for things immortal, and becomes strongly and easily impelled to follow the path which Christ Himself and His Mother have followed. The recitation of identical formulas repeated so many times, rather than rendering the prayer sterile and boring, has on the contrary the admirable quality of infusing confidence in him who prays and brings to bear a gentle compulsion on the motherly Heart of Mary.
Source: Ingruentium Malorum (Vatican.va)