The carnal man’s entire life and occupations have a carnal tendency and carnal aim; his prayer is carnal, his learning and his teaching of others are carnal, his writings are carnal; at every step, in nearly every word, the carnal life appears. The carnal life manifests itself especially in everything relating to the man’s appetites: here is the very seat of the carnal man. In proportion as the man by God’s grace lays aside the carnal life, he begins to trample his carnal appetites under foot—he alters his food, ceases to live for insatiable appetite; gradually in his heart, faith, hope, and love begin to reign. Instead of eating, drinking, dress, riches, God, the soul, eternal life, eternal torment, occupy his thoughts and imagination. Instead of the love of money, of food, drink, dress, the luxury of his house and surroundings, love for God, for men, a longing to dwell with the Angels and Saints; instead of food and drink, hunger and thirst, and the diligent reading and listening to the Word of God and Divine service. Previously his enemies were those who hindered his outward well-being, now he bears privations with equanimity; previously he slept much and found pleasure in sleep, now he sleeps little and intentionally deprives himself of sweet sleep; previously he gratified the flesh in every way, now he mortifies it so that it may not rebel against the spirit.

—St. John of Kronstadt, My Life in Christ