What vanities, what foolish fancies often occupy most of us, even in sight of the highest, the most important objects of faith, in sight of the greatest holiness. For instance, when a man stands before the icons of the Lord, of the Mother of God, of an Angel, of an Archangel, of one or a whole assembly of Saints, at home or in the temple, and, sometimes, instead of prayer, instead of laying aside, at this time, in this place, all worldly cares, he casts up his accounts and reckonings, goes over his expenses and receipts, rejoices at the gain, and grieves at the loss of profits, or the failure of some undertaking (without, of course, a single thought of spiritual profit or loss), or else he thinks evil of his neighbour, exaggerating his weakness, his passions, suspecting him, envying him, judging him, or if it is in church, he looks at the faces of those, standing near him, also how they are dressed, who is nice looking, and who not, or making plans what he shall do, in what pleasure or vanity he will spend the day, and so on. And this often happens at the time when the greatest, the most heavenly Sacrament of the Eucharist, that is, of the most-pure Body and Blood of our Lord, is being celebrated; when we ought to be wholly in God, wholly occupied in meditations on the mystery accomplished for our sakes, of the redemption from sin, from the eternal curse and death; and on the mystery of our being made godly in the Lord Jesus Christ. How low we have fallen, how earthly-minded we have become, and from what does it all proceed? From inattention, and the neglect of our salvation, from attachment to temporal things, from weakness of faith, or unbelief in eternity.

—St. John of Kronstadt, My Life in Christ