May the Lord help you to be fully alive and to preserve sobriety. But do not forget the chief thing, to unite the attention and mind with your heart, and remain there unceasingly, before the Lord. Every effort that you make in prayer must be directed towards this. Pray to the Lord, that He may give you this blessing: it is the treasure hidden in the field, the pearl beyond price.
Theophan the Recluse, The Art of Prayer, p. 198