There are times when a person’s body may remain completely still while the soul serves God in silent prayer. In such moments your prayer may be filled with a burning and awesome love, though one who sees you might never guess the depth of your inner service. Only those who are already at one with God may attain this prayer of inner flame and outer stillness. Such worship has greater power than devotion which can be seen by others. The “shells” of evil which feed upon wayward prayers cannot reach this silent prayer, for it is deeply hidden within the self.

from: Your Word is Fire – The Hasidic Masters on Contemplative Prayer  Tr. Arthur Green and Barry W. Holtz