Psalms 104:14-18

Verse 14

He causeth the grass to grow for the cattle - Doth God care for oxen? Yes, and there is not a beast of the field that does not share his merciful regards.

And herb for the serviee of man - Plants, esculent herbs, and nutritive grain in general; and thus he brings forth food (לחם lechem, bread) out of the earth. In the germination and growth of a grain of wheat there is a profusion of miracles. God takes care of man, and of all those animals which are so necessary to the convenience and comfort of man.
Verse 15

And wine - Wine, in moderate quantity, has a wondrous tendency to revive and invigorate the human being. Ardent spirits exhilarate, but they exhaust the strength; and every dose leaves man the worse. Unadulterated wine, on the contrary, exhilarates and invigorates: it makes him cheerful, and provides for the continuance of that cheerfulness by strengthening the muscles, and bracing the nerves. This is its use. Those who continue drinking till wine inflames them, abase this mercy of God.

Oil to make his face to shine - That is, to anoint the body; and particularly those parts most exposed to the sun and weather. This is of high importance in all arid lands and sultry climates. By it the pores are kept open, and perspiration maintained.

Bread which strengtheneth man's heart - In hunger not only the strength is prostrated, but the natural courage is also abated. Hunger has no enterprise, emulation, nor courage. But when, in such circumstances, a little bread is received into the stomach, even before concoction can have time to prepare it for nutriment, the strength is restored, and the spirits revived. This is a surprising effect; and it has not yet been satisfactorily accounted for.

Three of the choicest and most important articles of life are here mentioned: Wine, for the support of the vital and intellectual spirits; Bread, for the support of the nervous and muscular system; and Oil, as a seasoner of food, and for those unctions so necessary for the maintenance of health. Where wine, oil, and bread can be had in sufficient quantities, there animal food, ardent spirits, and all high-seasoned aliments, may be well dispensed with. Heavy taxes on these necessaries of life are taxes on life, itself; and infallibly lead to adulteration of the articles themselves; especially wine and oil, which, in countries where they are highly taxed, are no longer to be found pure.
Verse 16

The trees of the Lord are full of sap - ישבעו yisbeu, "are saturated."

The cedars of Lebanon - God's providence not only extends to then and cattle, but also to the trees of the field and forest. Many of these are not only sustained, but planted by his providence. Who ever planted the seeds of the cedars of Lebanon, or of the thousands of woods and forests on the globe? God himself sowed those seeds, and they have sprung up and flourished without the care of man.
Verse 17

Where the birds make their nests - צפרים tsipporim signifies swallows, sparrows, and small birds in general; here opposed to the חסידה chasidah or stork. Perhaps the heron may be understood, which is said to be the first of all birds to build her nest, and she builds it on the very highest trees. The general meaning is, that God has provided shelter and support for the greatest and smallest birds; they are all objects of his providential regard.
Verse 18

The high hills are a refuge - The barren tops of the highest hills, and the craggy abrupt precipices of the most stupendous rocks, are not without their uses: they afford protection, refuge, and food, for creatures whose dispositions and habits are suited to such places; and thus no part of the creation is useless. The creatures who are their inhabitants are necessary links in the great chain of animated beings, and show the wisdom and providence of God.

For a description of the covey, see Lev 11:5. The יעל yael, translated here the wild goat, is no doubt a creature of the stag or deer kind; the ibex, chamois, antelope, etc.
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