Eastern Orthodox spirituality is very interesting and rich.
There is, among other things, a form of prayer that is called hesychasm
http://en.wikipedia.org/wiki/Hesychasm, Jesus Prayer or prayer of the heart, which I am aware of and practiced.
Quoting from Wikipedia:
"In solitude and retirement the Hesychast repeats the
Jesus Prayer,
"Lord Jesus Christ, son of God, have mercy on me, a sinner." The Hesychast prays the Jesus Prayer 'with the heart'—with meaning, with intent, 'for real' (see
ontic). He never treats the Jesus Prayer as a string of syllables whose 'surface' or overt verbal meaning is secondary or unimportant. He considers bare repetition of the Jesus Prayer as a mere string of syllables, perhaps with a 'mystical' inner meaning beyond the overt verbal meaning, to be worthless or even dangerous. This emphasis on the actual, real invocation of Jesus Christ marks a divergence from Eastern forms of meditation."
I have a few books about that, including one (all my books are in French) that has the word
Philokalia in the title.
It has brought me great comfort.
Have a good day!