The restless hollowness which surfaces into our consciousness when we reflect in silence is already the nearness of God, who is like the pure light which, spread over everything, hides itself by making everything else visible in the silent lowliness of its being. The Incarnation urges us, in the experience of solitude, to trust the nearness -- it is not emptiness; to let go and then we will find; to give up and then we will be rich.
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.