Moses starts this Psalm by saying, Lord, You have been our dwelling place and our refuge in all generations. A testimony he could seal in truth throughout the years he and his people walked through the wilderness, facing enemies of all kinds. He, unlikely other prophets, had a very close relationship with God, Who spoke to him face to face. God said of him, With Moses I speak mouth to mouth. Clearly and not in dark speeches; and he beholds the form of the Lord… (Num. 12:8). Forty years wandering in the desert was indeed plenty time for Moses to reflect upon life in its limitations. He experienced all kinds of perils to realize that it was by the grace of God, and not by his own effort that he survived them all. He watched many suffer God’s judgments and even death at their lack of faith and disobedience. Life seemed to Moses fragile and short and uncertain. His knowledge of human’s limitations brought an awareness of its short span. Life, is really just a breath away from death in its time frame on this earth.