Michelle and I continue our guest blogging discussion of Into the Silent Land.  One of the things Marty Laird emphasizes is the use of a "prayer word," a sort of repetitive mantra, as a means by which to diminish the distractions that inevitably fill our mind.  I asked Michelle whether we might write about that -- focus on the focus, I suppose -- and she responded with a letter:    
Dear Robin,
I find to my dismay that you are  counting on me to wax eloquent on the subject of prayer words.  I will have a hard  time topping your pithy summing up - “This is a lot more confusing and difficult than it sounds.” -  since  I entirely agree, and wonder if I'm not going to cloud the issue more.  
So I'm going to admit right off the bat  that I have never settled into a single prayer word, or even the Jesus prayer (Lord Jesus Christ, Son of  God, have mercy on me, a sinner), all advice to the contrary  notwithstanding.  I tend to wake up each morning  with a snippet of a prayer or a single line of Scripture, usually from a psalm,  though not exclusively, bouncing around my head. 
For a long time I thought I was a  failure on the prayer word front, or at the very best a mere contemplative dilettante bouncing from phrase  to phrase.  It was the fortuitous discovery of Gabriel Bunge OSB's practical down to earth book on  prayer [1] in the stacks at Wernersville that helped me realize that I'm not a  failure, but perhaps a throwback.
Originally these prayers were "hurled  quickly like spears." They were meant to be short and to the point, not dulled by hanging onto them too hard or too long, and Evagrius Pontikos advises  that they be aimed directly at the distracting demon.  In  much the same fashion Jesus, tempted by Satan in the desert, hit back with single, appropriate lines from the Scripture.  For Evagrius the prayer word was less the refuge some authors describe - a sort of muffling veil you  pull over yourself to hide you from the distractions or the distractions from  you - and more of a weapon to beat off the distractions, or better  yet, pin them squirming to the wall so they can't return!  Your  image of the prayer word as a shepherd's crook quite neatly captures both these senses, I think.  The  crook pulls us back from the brink again and again, while it's not a bad weapon to shake at a wolf or crack over the head of  a snake.
Too, I like Laird's image of the prayer  word as a "vaccine" - a small dose of what ails you when you are distracted - and the advice  that follows: it doesn't really matter what word you choose.  It's  not about the "spiritual buzz" you get picking one or using it.  In this  vein, I would think "to do list" would be far better at vaccinating me against distraction than "grace" or "Jesus"!  I think we can be too fastidious about prayer, sometimes; too high-minded  for a people tied to the humility of the cross.  So no way am I going to laugh at your choice of "grass" as your prayer word!
I split the difference between the older  tradition of picking an appropriate phrase to hurl at specific distractions, and sticking with a  single phrase as Laird (and most others) advise.  Instead I stick with my snippets.  In part it's a way to "pray unceasingly" with this tidbit that rises again and again even when I'm not formally praying.   Of late I've begun to suspect it's also a catalyst for a kind of detachment from prayer words when I sit in prayer.  I spend so much of my day sorting through piles of words, looking for the pieces that fit just  right, like pieces into a complex jigsaw puzzle, that the picking of prayer  word, and the repeating of it, can be distracting.  Instead I seem to let my unconscious consult with the Holy Spirit and dispense a word or two for me, which I take up in humility and  gratitude.  
Snippets may stay a day, a few hang  around for a week or a month or more, but I've learned not to try to hurry their departure, no matter  how repetitive or unappealing (or appealing!) I find them.  I  find that it's best if I don't treat these phrases or words as koans -  puzzles  to be solved -  but use them as hallway  runners, quieting my footsteps as I move from door to door, or spears to puncture the particular  distractions that are haunting me.  I never have to strain to recall the phrase - it's automatic; the changing nature does  not cloud the discipline of always returning here.
You wrote of praying with the phrase  from Psalm 46, "Be still and know that I am God."  and turning the word "know" around in your head as you walked.  Patient Spiritual Director once suggested I pray with this verset, paring it back word by word:  Be still and know that I am. Be still and know.  Be still.  Be.    But why not strip it back to know?  Or and  for that matter?  
I prefer Robert Alter's translation of  this line, "Let go, and know that I am God."  He points out that the Hebrew verb is a bit of a surprise here; it carries  the connotation of relaxing your grip on something, rather than the freezing  of motion.  And in the end, of course, that's what must happen with the prayer word at what Laird calls the  third doorway, release your grip on it, stop wielding it as a tool, stop  immersing yourself in it, just let it go and let what happens, happen. 
My most potent recent experience of that  release was on my visit to the old novitiate at Wernersville last week.  I  was floating in the pool, seeking relief from the heat, and decided to experiment with praying in that place, rather than get  out and sit for a meditation on the side of the pool. I began, then quickly  realized that I was no longer paying attention to floating.  Panic  surfaced, until I realized I wasn't in fact sinking.  The whole period ended up being this continual "letting go my grasp" on my need to do something to stay afloat -  in both body and spirit.  
Which perhaps brings me to my next  question - at one point as we were planning this conversation, you said that you found the section on  the breath to be less helpful to you.      It may be the  scientist in me that is intrigued about the connections between the body and prayer;  certainly the very bodied experience  in the pool continues to play out in my prayer.   What  about the body in all this?
Here’s hoping for some relief from the desert heat!
Michelle
[1] Earthen Vessels: The Practice  of Personal Prayer According to the Patristic Tradition - it's not as smoothly written or as dryly humorous as Laird's book can  be, but like Into the Silent Land is deeply practical, straightforward  discussion of the contemplative life and well grounded in the Church's tradition, particularly that of the desert hermits
[2] Augustine reports that the desert  mystics used these phrases -  quondam modo iaculatas -  which can translate as “hurled like so many javelins” though Laird uses the translation “shot like arrows”.  I have to say I prefer the imagery of the less lady-like  spear-thrusts, which may be a bit bloodthirsty for someone who claims to seek  detachment!
(Image: Evagrius of Pontus, 4th century Egytian monk, as he appears on his Facebook page!)