And how does one go chasing after a glimpse of the uncreated Light? The Hesychasts, high on Mount Athos, bowed their heads upon their breasts, took a deep breath, and plunged in. What they plunged into was prayer. It began with a tack with which to fix the attention. It became breath itself, an inlet for the universe to invade one's body until the entire cosmos, drawn in, heaved out, was transformed into prayer. The body's posture was important. The breathing was to be carefully controlled so as to keep time with the words. Eventually the prayer, breathed in, united with their very blood and heartbeat; breathed out, it blessed the world. And some monks claimed after a while to have indeed seen the Light of the Transfiguration, uncreated energy beheld by bodily eyes.
~ from AND THE TREES CLAP THEIR HANDS by Virginia Stem Owens
Silence provides an atmosphere for prayer, and it preserves the growth that has been gained in prayer. People who begin to speak immediately after prayer in common, will not be able to preserve the fruits of their prayer. Their Recollection is dissipated, and they pour out all that has been accumulated within them. The observance of silence, on the other hand, allows the spirit of prayer to reverberate and take root in the heart.