We note the singular frequency of that designation in this song, in which it occurs six times. It is also found often in the Psalms. If Moses were the singer, we might see in this often-repeated metaphor a trace of influence of the scenery of the Sinaitic peninsula, which would be doubly striking to eyes accustomed to the alluvial plains of Egypt. What are the aspects of the divine nature set forth by this name? (1) Firm foundation: the solid eternity of the rock on which we can build. Petra: faithfulness to promises, unchanging. (2) Refuge: 'refuge from the storm'; 'my rock and my fortress and my high tower.' (3) Refreshment: rock from which water gushed out; and (4) Repose: 'shadow of a great rock'; 'shadow from the heat.' Trace the image through Scripture, from this song till Christ's parable of the man who 'built his house on a rock.' II. Every man's experience shows him that there is no such refuge anywhere else. We do not assert that every man consciously comes to that conclusion. All we say is that he would do so if he rightly pondered the facts. The history of every life is a history of disappointment. Take these particulars just stated and ask yourselves: What does experience say as to the possibility of our possessing such blessings apart from God? There is no need for us to exaggerate, for the naked reality is sad enough. If God is not our best Good, we have no solid good. Every other 'rock' crumbles into sand. Else why this restless change, why this disquiet, why the constant repetition, generation after generation, of the old, old wail, 'Vanity of vanities, all is vanity'? Why does every heart say Amen to the poet and the dramatist singing of 'the fever and the fret,' the tragic fare of man's life?