Everlasting Loving-Kindness
The psalmist comes from the far-reaching sky to the homely image of a father's pity. God is a great King, the mighty Creator, but the Spirit witnesses that we are His children and teaches us to say, Abba, Father. The idea of dust is that of frailty. Made of dust and fragile as an earthen vessel, man by his weakness appeals to Jehovah's compassion. The thought of frailty and helplessness is still further impressed by the figure of the fading flower, scorched by the hot desert wind. But, by force of contrast, the psalmist passes from man's brief span of life to God's eternal years. And God's love is as His life. Because God is eternal, His love is eternal. When once He loves, He loves always; He never wearies, never cools, and never lets go. A parent who fears God may leave a legacy of priceless worth to his children's children. See Psalms 103:17.
From Psalms 103:19 to the end, the psalmist pulls out all the stops in the great organ of existence. Angels and hosts of other intelligent beings who perform the Lord's will, all his works animate and inanimate, all saints, all souls, stars and suns, oceans, and mountains- all must join the “Hallelujah Chorus.”