Unceasing prayer is prayer that does not leave the soul day or night. It consists not in what is outwardly perceived–outstretched hands, bodily stance, or verbal utterances–but in our inner concentration on the intellect’s activity and on mindfulness of God born of unwavering compunction; and it can be perceived noetically by those capable of such perception.
~Nikitas Stithatos
Prayerful Life 