Bel Bows Down
Bel bows down, Nebo stoops;
Their idols were on the beasts and on the cattle.
Your carriages were heavily loaded,
A burden to the weary beast.
They stoop, they bow down together;
They could not deliver the burden,
But have themselves gone into captivity.
"Listen to Me, O house of Jacob,
And all the remnant of the house of Israel,
Who have been upheld by Me from birth,
Who have been carried from the womb:
Even to your old age, I am He,
And even to gray hairs I will carry you!
I have made, and I will bear;
Even I will carry, and will deliver you.
Isaiah foresees the siege of Babylon and the hasty evacuation of her idols. The carts and carriages on which the idols are loaded creak and groan, the weary animals labor under the burden of their load--a reminder that all our human artifacts-the "stuff" we give our devotion to and spend a lifetime acquiring--become a heavy burden at last.
In contrast, God bears (carries) his children from the cradle to the grave. “I made you,” he reminds us, and I will bear you-even to old age...even to gray hairs I will carry you!” 
"I made you." Nothing could be more comforting, for He makes nothing that is not good. God brought us into being through the parents he allowed. He permitted the infirmities and liabilities that have attended our years. He allows the cruel calamities that bring us to our knees. All this is that we may cast ourselves on him. His grace is sufficient, for our weakness calls forth his tender, loving care.
"I will bear." Our Lord has borne our sins in his body on the cross. He has borne our grief and sorrows. He has borne our waywardness; put up with our weaknesses; carried us when we could not walk, or stand. Will he then forsake us when we are old and gray? No! "His love in time past forbids (us) to think that he'll leave (us) at last ..."
So we may cast our burdens upon him because he has cared and will continue to care for us. "Fear not that thy need shall exceed His provision, / Our God ever yearns His resources to share; / Lean hard on the arm everlasting, availing; / Thy Father both thee and thy load will upbear."
 Bel (Baal) was the patron deity of Babylon; Nebo, in their mythology, was his son.
 The contrast is precise and vivid in the Hebrew text: The carts and carriages are "loaded" with weight (vs. 1). We are "loaded" upon God (vs. 3). Idols are a "burden" (i.e., a thing carried) (vs. 1); God has "carried" us from the womb (vs. 3). Idolaters cannot "escape" the burden (vs. 2). God carries our burdens and allows us to "escape" the load (vs. 4).
 From John Newton, "Begone, Unbelief, My Savior is Near."
 Annie Flint, “He Giveth More Grace”