by Rev. John Roothaan, S.J. Impr 1952. 72 page booklet The following pages are a translation of Father John Roothaan’s “De Ratione Meditandi.” It is an explanation of the most commonly used method of prayer proposed by St. Ignatius in the Spiritual Exercises. There is urgent need of the warning that whosoever wishes to meditate with fruit must assiduously beg for grace: “Lord teach me to pray; teach me to meditate.”