‘Come, my people, enter into your inner room’ — the shrine of your heart, which is closed to every conception derived from the sensible world, that image-free dwelling-place illumined by dispassion and the overshadowing of God’s grace;
‘shut your door’ — to all things visible;
‘hide yourself for a brief moment’ — the whole of man’s life is but a moment;
‘until the Lord’s anger has passed by’ (Isa.26:20 LXX); or, as the Psalms put it, ‘until iniquity has passed’ (Ps. 57:1).
This anger of the Lord and this iniquity may be caused by demons, passions and sins; as Isaiah says to God, ‘Behold, Thou art angry, for we have sinned’ (Isa.64:5).
A man escapes this anger by keeping his attention fixed continually within his heart during prayer, and by striving to remain within his inner sanctuary.
As it is written, ‘Draw wisdom into your innermost self’ (Job 28:18 LXX); ‘all the glory of the king’s daughter is within’ (Ps. 45:13 LXX).
Let us, then, continue to struggle until we enter the holy place of God, ‘the mountain of Thine inheritance, the dwelling, O Lord, which Thou hast made ready, the sanctuary which Thy hands have prepared’ (Exod. 15:17).
[…] Once you have realized that the Amorite within you is ‘as strong as an oak’, you should pray fervently to the Lord to dry up ‘his fruit from above’ — that is, your sinful actions, and ‘his roots from beneath’ — that is, your impure thoughts.
Ask the Lord in this way to ‘destroy the Amorite from before your face’ (Amos 2:9 LXX).
[…] When there is no wind blowing at sea, there are no waves; and when no demon dwells within us, our soul and body are not troubled by the passions.
If you always feel the warmth of prayer and divine grace you may apply to yourself the words of Scripture: you have ‘put on the armour of light’ (Rom. 13:12) and ‘your garments are warm’ (Job 37:17). But your enemies are ‘clothed with shame’ (Ps. 109:29) and with the darkness of hell.
When recalling your sins, do not hesitate to beat your breast. With these blows you will dig into your hardened heart and discover within it the gold-mine of the publican (cf. Luke 18:13); and this hidden wealth will bring you great joy.
Let the fire of your prayer, ascending upwards as you meditate on the oracles of the Spirit, burn always on the altar of your soul.
John of Karpathos (7th century): For the Encouragement of the Monks in India, 91, 93, 95-98, trans. G.E.H. Palmer, P. Sherrard, and K. Ware, The Philokalia, vol. 1 (Faber and Faber, London & Boston: 1979 @ J B Burnett.