By Your favour

Our security is in the favour of God alone! 

Mountain is symbolic of God's favour

"He speaks of himself as having, through the favor of God, put himself into a strong position - a position where he feared no enemy and no change; where he thought himself entirely secure - the state of "prosperity" to which he had referred in the previous verse. In that state, however, God showed him that there was no real security but in his favor: security not in what a man can draw around himself, but in the favor of God alone."
~Barnes' Notes on the Bible (commentary)