30 Do we believe that a man is lamenting with his whole heart, that he is entreating the Lord with fasting, and with weeping, and with mourning, who from the first day of his sin daily frequents the bathing-places with women; who, feeding at rich banquets, and puffed out with fuller dainties, belches forth on the next day his indigestions, and does not dispense of his meat and drink so as to aid the necessity of the poor? How does he who walks with joyous and glad step mourn for his death?
And although it is written, “You shall not mar the figure of your beard,” he plucks out his beard, and dresses his hair; and does he now study to please any one who displeases God? Or does she groan and lament who has time to put on the clothing of precious apparel, and not to consider the robe of Christ which she has lost; to receive valuable ornaments and richly wrought necklaces, and not to bewail the loss of divine and heavenly ornament? Although you clothe yourself in foreign garments and silken robes, you are naked; although you adorn yourself to excess both in pearls, and gems, and gold, yet without the adornment of Christ you are unsightly.
And you who stain your hair, now at least cease in the midst of sorrows; and you who paint the edges of your eyes with a line drawn around them of black powder, now at least wash your eyes with tears. If you had lost any dear one of your friends by the death incident to mortality, you would groan grievously, and weep with disordered countenance, with changed dress, with neglected hair, with clouded face, with dejected appearance, you would show the signs of grief. Miserable creature, you have lost your soul; spiritually dead here, you are continuing to live to yourself, and although yourself walking about, you have begun to carry your own death with you.
And do you not bitterly moan; do you not continually groan; do you not hide yourself, either for shame of your sin or for continuance of your lamentation? Behold, these are still worse wounds of sinning; behold, these are greater crimes— to have sinned, and not to make atonement— to have committed crimes, and not to bewail your crimes.
Source: The Treatises of Cyprian (New Advent)