The understanding of God as rock and fortress is often presented to me in the mountains near where I live.  When I look at mountains and even smaller hills, their height and breadth and solid strength speak eternity.  Mountains are steadfast, like God.  Not long ago, I was walking by the sea and the sea reminded me of those mountains because both suggest eternity.  Mountains are timeless in their stability, the sea in its constant movement.   God spoke to Moses on the Mount of Horeb.  Jesus calls out to us beside the sea and tells us he is "living water."   And he declares to us that belief in him will become living water in the heart of the believer.  This is such a lively image of God!  And so, we have the solid ground of being and the constant flow of a lively faith.  I want to stand on the rock that is higher than me and be a faithful fountain of living water for the world!