Fasting from words, fasting from a volume of speech, being willing to humbly accept the yoke of silence and quietude deprives the tongue of the mastery of our hearts and minds. The tongue is a very useful tool for the art of love and for the art of prayer, but it is also the means by which we afflict others and even our own selves so often. So it must be called into holy obedience.
When silence, wonder, adoration are diminished, so are human beings. We imagine we can get by on love and indeed we can. But love shrivels up and dies in the absence of contemplation and adoration. Love, human love, needs to be transfigured, transcended, if it is to be true to its deepest self.