What does it mean to pray without ceasing? Some groups take this to mean that God wants perpetual prayer-prayer marathons, so to speak. So all day and all night long, people take turns to pray continually. Is this what God wants us to do? Obviously not, for He has given us work to do. He wants us to have rest periods as well. To pray unceasingly means to be diligent in prayer. Morning prayers, evening prayers, table prayers, and prayers in special circumstances add up to the diligence God wants. (Rudolph F. Norden, Every Day with the Savior: Daily Devotions. Concordia, St. Louis, 2004. September 14 devotion.)
I read this with severe disappointment. It sounds too much like my sinful nature which says, "God's Word certainly cannot mean it what it says. 'Pray without ceasing,' (1 Thes. 5:17) certainly is hyperbole." It should raise flags that our enemy also speaks this way.
Norden's objection to unceasing prayer is couched in a straw man, that unceasing prayer means a continual prayer vigil, where a church or group prays unceasingly. This is a straw man because the Epistle does not indicate that these are "group" prayers, but that all of us should pray unceasingly. Furthermore, his critique--that God doesn't mean this because we have other things to do--is invalid, as the example itself shows that no one person is praying all the time, but shifts are taken so that people can do other things. I wonder why he tries so hard to re-interpret this passage.
The Church Fathers have a radically different understanding of what unceasing prayer means. St. Basil the Great writes,
For prayer and psalmody, however...every hour is suitable, that, while our hands are busy at their tasks, we may praise God sometimes with the tongue (when this is possible, or, rather, when it is conducive to edification); or, if not, with the heart.... Thus we acquire a recollected spirit--when in every action we beg from God the success of our labors and satisfy our debt of gratitude to him who gave us the power to do the work, and when, as has been said, we keep before our minds the aim of pleasing him. If this is not the case, how can there be consistency in the words of the apostle bidding us to 'pray without ceasing," with those other words, "we worked night and day." (The Long Rules, Q37.R.; quoted from ACCS, vol. NT IX)
St. Augustine likewise says,
Let your desire be before him, and 'the Father, who sees in secret, shall reward you.' For it is your heart's desire that is your prayer. If your desire continues uninterrupted, your prayer continues also. For it was not without meaning, when the apostle said, 'Pray without ceasing.' Are we to be 'without ceasing' in bending the knee and prostrating the body and lifting up our hands, such that he says, 'without ceasing'? If that is what 'without ceasing' means, then I do not believe it is possible. There is another kind of inward prayer without ceasing, which is the desire of the heart. (Augstine, Commentary on the Psalms, 37.14; quoted in ACCS, vol. NT IX)
What's interesting about the quote from St. Augustine is that he says something similar to Norden, that we cannot pray "liturgically" without ceasing. It would be impossible to form petitions in our mind to God at all times--and especially to accompany that with proper prayer posture.
But both of these Fathers describe a kind of prayer of faith. It is not so much a prayer of the mind, which forms words and sentences, but more a prayer of the heart, a prayer that beats along with our heart, that accompanies our rising and resting, our work and our speech. Later Eastern Fathers describe this kind of prayer especially in terms of the Jesus Prayer: "Lord Jesus Christ, Son of God, have mercy on me (a sinner)." There is a host of teaching on what this means and how it was practiced. During the 14-15th Centuries it was controversial, and Western Christians since have been prone to denigrate this at times as nearly un-Christian mysticism and "navel gazing." (Which incidentally, was a slur against Eastern Orthodox monks, not against Hindus or Buddhists, as many today take it to mean).
Apart from the historical (and present) controversy, the practice of saying the Jesus Prayer is excellent and commendable. As a prayer it is Biblical, echoing the cry of the publican (Luk. 18:13); the blind men (Mat. 9:27; and in Mat. 20:30), the Canaanite woman (Mat. 15:22); etc. It is the simplest cry of a faithful Christian. It is also short and memorable, easy to say in the mind while doing other work, or even while falling asleep.
While saying the Jesus Prayer (or any prayer) continuously is far from our abilities, it is dangerous for the Christian to simply dismiss the notion as impossible. We can certainly take a page from the Fathers who show us how prayer is so conjoined to faith that they are inseparable.
Lord Jesus Christ, Son of God, have mercy on me, a sinner.