People seeking advice on prayer frequently ask about Centering Prayer, and others frequently refer to it (or variations of it) without being aware of it. So it might be worth putting my opinion on line, as the whole question seems topical.
The general idea of Centering Prayer is becoming aware of God as the center of one's being, the principle of life in us. For the baptized, seeking God is not exclusively to be done outside oneself, after all. The awareness of God's sustaining life comes about from detachment from all thoughts. Generally speaking, one chooses a quiet time of day and sits for twenty minutes. As one becomes aware of thoughts or other stimuli, the pray-er notes them, but then allows the thoughts to pass on, uninspected, usually by use of a 'sacred word', itself not to be 'meditated' upon, but simply to help loose our attention from the thoughts that inevitably enter the mind.
First of all, we should be clear that Centering Prayer as taught especially by the Cistercians Thomas Keating and the late Basil Pennington, is fairly nuanced. When I wrote above of people referring to Centering Prayer without being aware of it, often they speak of trying to empty their minds of all thoughts. Strictly speaking, this is more Buddhist than Christian (in fact, it probably more closely related to the state of Nirvana than any normally acknowledged states of mind in most forms of Buddhism). Centering Prayer is perfectly comfortable with thoughts being present. It is normal for our brains to generate thoughts. The question is what we do with them. Monastic practice in Christianity has always had an acute interest in thoughts, and to examine one's thoughts first requires one to become aware of them. In this regard, I find Centering Prayer as potentially very helpful. But we should be clear that those who speak of emptying the mind are giving a distorted view of Centering Prayer.
A second thing that CP is not is a means of attaining high states of consciousness. Again, the sacred word is not meant to induce a trance or some kind of transport. CP is not even aimed at any particular affective result, which puts it in good company in terms of Christian prayer in general. We pray because we are human and need to pray, not because it feels good every day. God is not a drug, but it the Almighty and Infinite Creator. The Desert Fathers considered prayer to be a battle (as does the Catechism--see para. 2275). "War against us is proof that we are making war," taught St. John Climacus. By this he means that most of the time, when we start praying, demonic forces immediately attack us to get us to stop, normally by means of distractions. Centering Prayer assists us so that the one praying pays no particular attention to any thoughts, good or bad. This trains our minds to let go of thoughts when we need to and helps us in the battle against distractions.
So I've mentioned some good points about Centering Prayer. With those as a background, let me now say that I don't normally recommend CP except for those who are fairly advanced in the life of prayer. Why not? In my opinion, the principal missing factor in the writing of Fr Keating and Fr Pennington is asceticism. I don't fault them for the omission, but we as monks should perhaps be attentive to the fact that we tend to live a fairly ascetic life by default and take for granted such helpful givens as community recitaiton of Psalms, lectio divina, spiritual reading at table and elsewhere, fasting, customary works of charity (serving at table, doing dishes) and humility (sitting in statio), obedience, silence, and so on. As Metropolitan Anthony Bloom once wrote, there is no authentic contemplative prayer without asceticism. The Catechism says this:
"There is no holiness without renunciation and spiritual battle [2015]."
"If we do not want to act habitually according to the Spirit of Christ, neither can we pray habitually in his name. The 'spiritual battle' of the Christian's new life is inseparable from the battle of prayer [2725]."
Centering Prayer, it seems to me, risks losing sight of these realities. By contrast, in lectio divina, one is constantly confronted with challenges to reform one's life and live according to the gospel, often in disconcertingly direct ways. Fr Michael Casey writes, “We who pray ‘forgive us as we forgive’ cannot afford to live in a state of conflict with others.”
Secondly, I believe that one needs to have a very strong personal relationship with God before one can jump to the level of awareness of God as the Ground of Being. God is one who has love affairs with His people, who knows us intimately before we are even conceived in the womb. There is an infinite amount to know about God. Again, I find prayer centered on Scripture and Liturgy brings us closer to God as a Three-Personed divinity, not merely as The Divine Source.
This brings me to the last point about Centering Prayer, that it seems not to take the Trinity into account, particularly the Person of Jesus Christ. "There is no other way of Christian prayer than Christ [CCC 2664]." While I don't believe that it is the intention of Fr Keating and Fr Pennington to omit Christ, the technique involved does not sufficiently acknowledge His central place, that we pray in His name.
If there are these problems, do I ever recommend Centering Prayer? I do, in fact, and I even practice it from time to time myself. The reason for this relates to the aim of detachment mentioned above, as well as awareness of thoughts. Often times our minds are so busy that we simply are unaware of the fact that we are thinking. Thoughts go directly to being imperatives without our reflecting on it. As Mother Maria-Thomas Beil once taught me, monks should aim to 'put a deliberate distance between themselves and their thoughts'. We slow down so as to intercept thoughts before we act upon them. CP helps a great deal in this effort.
Secondly, detachment even from good thoughts is part of the Evagrian method of prayer, validated by Cassian. I mentioned above that we do not pray in order to receive spiritual favors from God. Noting our attraction to such favors can help dispose us toward detachment in this realm, prepaing us for potential dryness and even dark nights (though I personally think that genuine Dark Nights are much rarer than many think; usually periods of dryness are just that: the normal valleys that affect any long-term relationship, even a relationship with God, with dullness).
Finally, I only would recommend Centering Prayer as an element within a total discipline that includes more standard types of prayer. Often times, vocal prayer and meditation bring us to a place that seems to be a dead end. CP can help illuminate the way forward. On the other hand, the practice of detachment, assisted by CP, prepares us to re-enter traditional styles of prayer with a larger tool chest, more deeply grounded in the range of possibilities in prayer, more ready to respond to difficult challenges that God has prepared for us.