Has a glutton, a great eater and drinker, become abstinent, temperate, not through illness or any consciousness of the harmfulness of intemperance to the body, but from the consciousness of a moral, higher purpose—he has become so by the power of grace. Has anyone that was previously full of hatred, rancour and revenge suddenly become benevolent, loving even his enemies, his ill-wishers and revilers, not remembering any offences—he has become so by the regenerating, changing, and renewing power of grace. Has anyone that was formerly cold towards God, towards the temple, the Divine service, to prayer, and in general to the Sacraments of religion, which cleanse and strengthen our souls and bodies, suddenly changed in his soul, and become fervent towards God, to Divine service and prayer, reverent towards the Sacraments—he has become so by the action of the saving grace of God. From this it is evident that many live without grace, not recognising its importance and indispensability, and do not seek it, although the word of the Lord says: “Seek ye first the kingdom of God and His righteousness.” Many live in plenty and ease, enjoy blooming health, eat with pleasure, drink, walk, amuse themselves, write or work in the various branches of human activity, but they have not the grace of God in their hearts, that priceless treasure of the Christian, without which no one can be a true Christian and an inheritor of the kingdom of heaven.

My Life in Christ
St. John of Kronstadt