“In the beginning it is necessary to say the prayer in a whisper, or even louder when confronted by duress and inner resistance. When this good habit is achieved to the point that the prayer may be sustained and said with ease, then we can turn inwardly with complete outer silence. In the first part of the little book {Way of the Pilgrim} a good example is given of the initiation into the prayer. Sound persistence and effort, always with the same words of the prayer not being frequently altered, will give birth to a good habit. This will bring control of the mind, at which time the presence of Grace will be manifested.”
(Elder Joseph of Vatopaidi on the Jesus Prayer)