Today is the feast of St. Juan de Yepes y Álvarez, better known as John of the Cross, Doctor of the Church. From The Dark Night of the Soul (Book I, Chapter V):
By reason of the concupiscence which many beginners have for spiritual consolations, their experience of these consolations is very commonly accompanied by many imperfections proceeding from the sin of wrath; for, when their delight and pleasure in spiritual things come to an end, they naturally become embittered, and bear that lack of sweetness which they have to suffer with a bad grace, which affects all that they do; and they very easily become irritated over the smallest matter—sometimes, indeed, none can tolerate them. This frequently happens after they have been very pleasantly recollected in prayer according to sense; when their pleasure and delight therein come to an end, their nature is naturally vexed and disappointed, just as is the child when they take it from the breast of which it was enjoying the sweetness. There is no sin in this natural vexation, when it is not permitted to indulge itself, but only imperfection, which must be purged by the aridity and severity of the dark night.