From a review of the Anglican Brevery, by Addison H. Hart in Touchstone.

” My own sincere belief in the importance of the Daily Office was influenced by, among others, the late Anglican spiritual writer, Martin Thornton, whose books (in particular, Pastoral Theology: A Reorientation; Christian Proficiency; and English Spirituality) made a convincing case that the classical shape of a sound Christian piety is the regular (regular in the sense of a “rule of life”) commitment to the three essentials: Eucharist, Private Devotion, and the Daily Offices. If one practices this “threefold rule,” he will be adequately nourished, inwardly transformed, and possess the right God-given balance of objective and subjective elements in his spiritual life. Such a rule is as old as the faith itself.
Of the three ingredients, the Daily Office—praying the Psalms and listening to the Word—has the distinction of standing objectively above and beyond ourselves and our worst tendencies to become emotionally self-serving in prayer, a condition to which many subjective and often sentimental “devotions” lead. Rather, the Office lifts us up to the ongoing prayer of the Church, addressing us with authority even as we address the Lord. Its beauty and benefit to us is its very objectivity.”