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.
We have not been raised to cultivate a sense of Mystery. We may even see the unknown as an insult to our competence, a personal failing. Seen this way, the unknown becomes a challenge to action. But Mystery does not require action; Mystery requires our attention. Mystery requires that we listen and become open. When we meet with the unknown in this way, we can be touched by a wisdom that can transform our lives.