Much labour and time is needed in prayer, in order painfully to achieve a state of mind free from all disturbance — that new heaven of the heart in which Christ dwells, as the Apostle says: ‘Know ye not your own selves, how that Jesus Christ dwells in you?’ (2 Cor. 13:5)
— Igumen Chariton of Valamo: /The Art of Prayer: An Orthodox Anthology/ p170