The spiritual function of fierce terrain (in the apophatic tradition) is to bring us to the end of ourselves, to the abandonment of language and the relinquishment of ego. A vast expanse of jagged stone, desert sand, and towering thunderheads has a way of challenging all the mental constructs in which we are tempted to take comfort and pride, thinking we have captured the divine. The things that ignore us save us in the end.
An individual sitting in an emergency waiting room noticed a man in a wheel chair in considerable pain with his wife by his side. For a half hour the couple never exchanged a word; they just held hands, looking intently at each other. Once or twice the woman patted the man's face. The person watching said the feeling of love was so tangible in the room that she felt she was sharing their silent communion. Their silent love was also joyful and portrayed the fullness of a human relationship. That's what spiritual silence is all about. Love does not necessarily require words. It often requires silence.