[157] For exceeding joy, the best of all feelings, falling on the soul when completely unexpected, makes it greater than it was before, so that the body can no longer contain it by reason of its bulk and magnitude; and so, being closely packed and pressed down, it distils drops which it is the fashion to call tears, concerning which it is said in the Psalms, "Thou shalt give me to eat bread steeped in tears;" [156] and again, "My tears have been my bread day and night;" [157] for the food of the mind are tears such as are visible, proceeding from laughter seated internally and excited by virtuous causes, when the divine desire instilled into our hearts changes the song which was merely the lament of the creature into the hymn of the uncreated God.