I have stretched forth my hands to thee. Here appears the good effect of meditation, that it stirred David up to pray; for if we reflect seriously upon the acting's of God towards his people, and towards ourselves in our own experience, this will necessarily lead out our minds to seek after him, under the alluring influence of his goodness. Prayer, indeed, springs from faith; but as practical proofs of the favor and mercy confirm this faith, they are means evidently fitted for dissipating languor. He makes use of a striking figure to set forth the ardor of his affection, comparing his soul to the parched earth. In great heats we see that the earth is cleft, and opens, as it were, its mouth to heaven for moisture. David therefore intimates, he drew near to God with vehement desire, as if the very sap of life failed him, as he shows more fully in the verse which follows. In this he gives another proof of his extraordinary faith. Feeling himself weak, and ready to sink into the very grave, he does not vacillate between this and the other hope of relief, but fixes his sole dependence upon God. And heavy as the struggle was that he underwent with his own felt weakness, the fainting of spirit he speaks of was a better stimulant to prayer than any stoical obstinacy he might have shown in suppressing fear, grief, or anxiety. We must not overlook the fact, how in order to induce himself to depend exclusively upon God, he dismisses all other hopes from his mind, and makes a chariot to himself of the extreme necessity of his case, in which he ascends upwards to God.

I stretch forth my hands unto thee - In prayer. I have nowhere else to go. See Psalm 88:9.
My soul thirsteth after thee, as a thirsty land - As land in a time of drought "seems" to thirst for rain. See the notes at Psalm 63:1. Compare Psalm 42:1. The word rendered "thirsty" here means properly "weary." The idea is that of a land which seems to be weary; which has no vigor of growth; and where everything seems to be exhausted. The same word occurs in Isaiah 32:2 : "As the shadow of a great rock in a weary land."

I stretch forth my hands - This is a natural action. All in distress, or under the influence of eager desire, naturally extend their hands and arms, as if to catch at help and obtain succor.
As a thirsty land - Parched and burned by the sun, longs for rain, so does my thirsty soul for the living God.

I stretch forth my hands unto thee,.... In prayer, as the Targum adds; for this is a prayer gesture, 1-Kings 8:38; both hands were stretched forth, earnestly imploring help, and ready to receive and embrace every blessing bestowed with thankfulness;
my soul thirsteth after thee as a thirsty land. As a dry land, which wants water, gapes, and as it were thirsts for rain, which is very refreshing to it; so his soul thirsted after God, after his word and ordinances, after communion with him in them, after his grace and fresh supplies of it; particularly after pardoning grace and mercy, after the coming of Christ, and the blessings of grace by him; as reconciliation, atonement, righteousness, and salvation; after more knowledge of God and Christ, and divine truths; and after the enjoyment of them in heaven to all eternity. Some copies read, "in a thirsty land" (x), and so some versions; see Psalm 42:1.
Selah; on this word; see Gill on Psalm 3:2.
(x) Cod. Hebrews. Bomberg. Venet. "in terra siticulosa", Musculus, Tarnovius.

As land - Thirsteth for rain.