Psalms 103:4

4Who redeemeth thy life from the grave The Psalmist expresses more plainly what our condition is previous to God’s curing our maladies — that we are dead and adjudged to the grave. The consideration that the mercy of God delivers us from death and destruction ought, therefore, to lead us to prize it the more highly. If the resurrection of the soul from the grave is the first step of spiritual life, what room for self-gloriation is left to man? The prophet next teaches us that the incomparable grace of God shines forth in the very commencement of our salvation, as well as in its whole progress; and the more to enhance the commendation of this grace, he adds the word compassions in the plural number. He asserts that we are surrounded with them; as if he had said, Before, behind, on all sides, above and beneath, the grace of God presents itself to us in immeasurable abundance; so that there is no place devoid of it. The same truth he afterwards amplifies in these words, thy mouth is satisfied, by which metaphor he alludes to the free indulgence of the palate, to which we surrender ourselves when we have a well-furnished table; for those who have scanty fare dare scarcely eat till they are half satisfied. (165) Not that he approves of gluttony in greedily devouring God’s benefits, as men give loose reins to intemperance whenever they have great abundance; but he borrowed this phraseology from the common custom of men, to teach us that whatever good things our hearts can wish flow to us from God’s bounty, even to perfect satisfaction. Those who take the Hebrew word עדי, adi, for ornament, (166) mar the passage by a mere conceit of their own; and I am surprised how so groundless an imagination should have come into their minds, unless it may be accounted for from the circumstance that it is usual for men of a prying or inquisitive turn of mind, when they would show their ingenuity, to bring forward mere puerilities. The Psalmist next adds, that God was constantly infusing into him new vigor, so that his strength continued unimpaired, even as the Prophet Isaiah, (Isaiah 65:20) in discoursing on the restoration of the Church, says that a man of a hundred years old shall be like a child. By this mode of expression, he intimates that God, along with a very abundant supply of all good things, communicates to him also inward rigor, that he may enjoy them; and thus his strength was as it were continually renewed. From the comparison of the eagle, the Jews have taken occasion to invent, for the purpose of explanation, a fabulous story. Although they know not even the first elements of any science, yet so presumptuous are they, that whatever may be the matter treated of, they never hesitate to attempt to explain it, and whenever they meet with any thing which they do not understand, there is no figment so foolish that they do not bring forward, as if it were an oracle of God. Thus, for expounding the present passage, they give out that eagles, every tenth year, ascend to the elemental fire, that their feathers may be burnt, (167) and that then they plunge themselves into the sea, and immediately new feathers grow upon them. But we may easily gather the simple meaning of the Prophet from the nature of the eagle, as described by philosophers, and which is well-known from observation. That bird continues fresh and vigorous, even to extreme old age, unenfeebled by years, and exempt from disease, until it finally dies of hunger. That it is long-lived is certain; but at last, its beak or bill grows so great that it cannot any longer take food, and, consequently, is forced to suck blood, or to nourish itself by drinking. Hence the ancient proverb in reference to old men who are addicted to drinking, The eagle’s old age; for necessity then constrains eagles to drink much. But as drink alone is insufficient to maintain life, they die rather through hunger, than fail by the natural decay of strength. (168) Now we perceive, without the help of any invented story, the genuine meaning of the Prophet to be, that as eagles always retain their rigor, and even in their old age are still youthful, so the godly are sustained by a secret influence derived from God, by which they continue in the possession of unimpaired strength. They are not always, it is true, full of bodily vigor while in this world, but rather painfully drag on their lives in continual weakness; still what is here said applies to them in a certain sense. This unquestionably is common to all in general, that they have been brought out of the grave, and have experienced God to be bountiful to them in innumerable ways. Were each of them duly to reflect how much he is indebted to God, he would say with good reason that his mouth is filled with good things; just as David, in Psalms 40:5, and Psalms 139:18, confesses that he was unable to reckon up the Divine benefits, because “they are more in number than the sands of the sea.” Did not our own perverseness blind our understandings, we would see that, even in famine, we are furnished with food in such a manner, as that God shows us the manifold riches of his goodness. With regard to the renovation of our strength, the meaning is, that since, when our outward man decays, we are renewed to a better life, we have no reason to be troubled at the giving way of our strength, especially when he sustains us by his Spirit under the weakness and languishing of our mortal frames.

“They that wait upon the Lord shall renew their strength;
they shall mount up with wings as eagles.”
Isaiah 40:31

The eagle seems to have borrowed its Hebrew name נשר, nesher, from the shedding of its plumage. Its root is the Chaldee verb נשר, nashar, decidit, defluxit ,he fell, he shed “The name agrees with שור, to look at, ” says Bythner, “because the eagle can look at the sun with a straight and steady gaze; also with ישר, to be straight, because it flies in a straight course.”