From A Happy Pocket Full of Money by David Cameron (which is blowing my mind):
What does it mean to pray ceaselessly? Consider this: It has been said that even before you ask, it is given unto you. It has also been said that ask and it shall be given unto you. Do you catch that? Asking is not begging, you do not beg The Source, for it is already given to you even before you ask. Begging and wanting simply gives a lack of that which you beg and want. This is not just a spiritual idea; it is also provable using quantum physics. The quantum 'soup' literally contains all possibilities of everything, Now, Here. In other words, that spiritual promise is also a scientific fact. Let us move on. It is also said that you can do anything if you believe. It has also been said that whatever you put your attention and intention on takes form. That is how you create things out of the quantum 'soup' of pure energy - by attention, intention, and belief.
Many masters, teachers, and sages from all cultures and times have told us to not worry, to practice detachment, to trust in the mysterious workings of the universe - not only because the universe works with supreme intelligence, but also because you may not be aware of what your soul or higher self is choosing. Here then, is what it means to pray ceaselessly: You have a desire; you will it to come into being, to manifest. You intend it wholeheartedly, clearly, focused, and with certainty. You pass this intent on to The Source, in whichever way you know how. Simple intention is enough, although meditation, stillness, are more effective when you have time to do so.
So, you pass on your intent, and you become detached from it. In other words, you watch it from behind the scenes, without a desire that it happens in any particular way or 'time' or sequence. And because you know this works, because of your certainty and consistency, detachment and gratitude, it will take form in the most unexpected and miraculous of ways. That is prayer.
Praying without ceasing is going through the whole day, everyday, with such focused intention for all your life's desires, with certainty, detachment and gratitude. This is not something you do once at a special time during the day and act totally different and confused the rest of the day. It is something that becomes a lifestyle. That is praying ceaselessly. Prayer is meant to be active, ever-present and part of normal wakefulness. It is co-creative with The Source; it wills to action, it is self-assertive...
There is no criterion by which The Source decides to grant or not to grant prayers. The laws of the universe apply to all equally and unfailingly. Prayer is an inward energetic process, a call you give out with a detached expectation of an answer, without a shred of doubt. It is strong and certain will. When you realize that even the request is not necessary, that you are one with All That Is including whatever it is that you wish to have and the granter of that wish, and the conveyer of the wish, you will truly be praying and receiving without fail. For your prayers will be of pure gratitude for what already is given unto you even before you ask. The request is not necessary. Just be grateful and smile!