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.
We cannot expect answers from God after only five minutes of silence... Meister Eckhart emphasized the importance of the listening heart that listens to God alone ... that God desires nothing more than a heart that detaches itself in silence from everything and turns and listens.