Psalms 119:81

Here we have the psalmist, I. Longing for help from heaven: My soul faints; my eyes fail. He longs for the salvation of the Lord and for his word, that is, salvation according to the word. He is not thus eager for the creatures of fancy, but for the objects of faith, salvation from the present calamities under which he was groaning and the doubts and fears which he was oppressed with. It may be understood of the coming of the Messiah, and so he speaks in the name of the Old Testament church; the souls of the faithful even fainted to see that salvation of which the prophets testified. (Pe1 1:10); their eyes failed for it. Abraham saw it at a distance, and so did others, but at such a distance that it put their eyes to the stretch and they could not stedfastly see it. David was now under prevailing dejections, and, having been long so, his eyes cried our, "When wilt thou comfort me? Comfort me with thy salvation, comfort me with thy word." Observe, 1. The salvation and consolation of God's people are secured to them by the word, which will certainly be fulfilled in its season. 2. The promised salvation and comfort may be, and often are, long deferred, so that they are ready to faint and fall in the expectation of them. 3.

— Matthew Henry's Concise Commentary (public domain)