The various methods described by the Fathers (sitting down, making prostrations, and the other techniques used when performing this prayer) are not suitable for everyone …. There is just one method which is obligatory for all : to stand with the attention in the heart. All other things are beside the point, and do not lead to the crux of the matter.
It is said of the fruit of this prayer, that there is nothing higher in the world. This is wrong….. All fruit can be received without this prayer, and even without any oral prayer, but merely by directing the mind and heart towards God.
The essence of the whole thing is to be established in the remembrance of God, and to walk in His presence. You can say to anyone: ‘Follow whatever methods you like—recite the Jesus Prayer, perform bows and prostrations, go to Church : do what you wish, only strive to be always in constant remembrance of God.’ I remember meeting a man in Kiev who said: ‘I did not use any methods at all, I did not know the Jesus Prayer, yet by God’s mercy I walk always in His presence. But how this has come to pass, I myself do not know. God gave !
– Theophan the Recluse, The Art of Prayer, pp. 97-99, Igumen Chariton of Valamo