There was an interesting combination of theology (majoritively through the use of commentary on the Lord's Prayer) and practical advice. The clear instructions of praying three times a day, facing towards the east and having a position of outstretched hands and eyes facing upward, all of which is giving as a suggestion and not a command, give the twenty-first century Christian a fresh yet ancient way to approach his/her prayer life. Origen challenges the modern lackadaisical disposition towards prayer and calls for a preparatory time of clearing the mind before prayer and situating oneself to giving God due reverence in the act of praying. This dismisses the desire to pray while doing other things, giving prayer some sort of supposed efficiency (as if it lacked such benefits). No, for Origen, prayer is a special time by itself, which should be treated as such.
This treatise of prayer was read in the Origen: An Exhortation to Martyrdom, Prayer, and Selected Works" by the Classics of Western Spirituality. I would recommend this to an adult small group at church that is open to the power and symbolism of liturgy and who are wanting to challenge their view on prayer.