At the beginning of his novel based on the apocryphal book of Tobit, Frederick Buechner captures this wonderful insight on prayer through one of his characters, Raphael the archangel:

I am Raphael, one of the seven archangels who pass in and out of the presence of the Holy One, blessed be he. I bring him the prayers of all who pray and those who don't even know that they're praying.

Some prayers I hold out as far from me as my arm will reach, the way a woman holds a dead mouse by the tail when she removes it from the kitchen. Some, like flowers, are almost too beautiful to touch, and others so aflame that I'd be afraid of their setting me on fire if I weren't already more like fire than I am like anything else. There are prayers of such power that you might almost say they carry me rather than the other way round—the way a bird with outstretched wings is carried higher and higher on the back of the wind. There are prayers so apologetic and shamefaced and halfhearted that they all but melt away in my grasp like sad little flakes of snow. Some prayers are very boring.