A face downcast in sadness professes a hunger against one's will, not a voluntary fast. If a person is willing, why the sadness? If unwilling, why the fast? One deserves to live in such pain who creates for himself a vice out of virtue, a lie out of truth, a loss out of gain, a sin out of forgiveness. If the farmer does not push the plow, if he does not dig a furrow, if he does not cut down the briars, if he does not root out the grass, if he does not place seeds in the earth, he deceives himself, not the earth; he does no harm to the earth, but he produces no harvest for himself. And if the one who deceives the earth with his fraudulent and empty hand so deprives, so cheats, and so attacks himself, what will one do, what will he have, what will he find who lies to God with his flesh starving but brimming over with hypocrisy?
Sermon 7, section 5