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O monk, take thou the greatest possible care that thou sin not, lest thou disgrace God Who dwelleth in thee, and thou drive Him out of thy soul.

Abba Gerontius of Petra said that many, tempted by the pleasures of the body, commit fornication, not in their body but in their spirit, and while preserving their bodily virginity, commit prostitution in their soul. 'Thus it is good, my well-beloved, to do that which is written and for each one to guard his own heart with all possible care.' (Prov. 4.23)