My eyes have waxed dim in looking for thy word This verse is very similar to the preceding, -- transforming to the eyes what had been said before concerning the soul. The only difference is, that, instead of longing after salvation or help, the expression, longing after God's word compromise, is here used; for salvation is an act, as it is termed; that is to say, it consists in effect, whereas a promise keeps us suspended in expectation. God may not, all at once, openly perform what he has promised; and, in this case, it being only in his word that he promises us help, there is no other way by which we can hope for help, than by our reposing on his word. As, then, the word precedes, in order, the help which God affords, or, rather, as it is the manner in which it is represented to our view, the prophet, when sighing after salvation, very properly declares that he kept his eyes fixed on the Divine word, until his sight failed him. Here we have presented to us the wonderful and incredible power of patience, under the infirmity of the flesh, when, being faint and deprived of all rigor, we have recourse to God for help, even while it is hidden from us. In short, the prophet, to prevent it from being supposed that he was too effeminate and faint-hearted, intimates that his fainting was not without cause. In asking God, When wilt thou comfort me? he shows, with sufficient plainness, that he was for a long time, as it were, cast off and forsaken.

Mine eyes fail for thy word - The same word in Hebrew as in the previous verse and in Psalm 73:26. The idea here is that of looking out for a thing - of "straining the eyes" - so that their power becomes exhausted. The language expresses a longing desire - a waiting - an intense wish - for a thing, as when we look for a ship long expected, or for a friend long absent, or for help when in danger. Such a desire the psalmist had for the word of God, for divine truth.
Saying, When wilt thou comfort me? - How long shall I be compelled to wait for comfort? How often in the Psalm do the expressions occur, "When," and "How long!" How often in the life of the believer now are similar expressions appropriate! God often seems greatly to try the faith and patience of his people by mere delay; and the strength of faith and the power of religion are shown in such circumstances by persevering faith in the divine promises, even when there seems to be no evidence that he will interpose.

Mine eyes fail - With looking up for the fulfillment of thy promise, as my heart fails in longing after thy presence.

Mine eyes fail for thy word,.... Either with looking for the Messiah, the essential Word, that was to be, and afterwards was made flesh, and dwelt among men; or for the fulfilment of the word of promise, on which he was made to hope; but that being deferred; and he believing in hope against hope, and looking out continually till it was accomplished, his eyes grew weary, and failed him, and he was just ready to give up all expectation of it; see Psalm 77:8;
saying, when wilt thou comfort me? The people of God are sometimes very disconsolate, and need comforting, through the prevalence of sin, the power of Satan's temptations, the hidings of God's face, and a variety of afflictions; when they apply to God for comfort, who only can comfort them, and who has his set times to do it; but they are apt to think it long, and inquire, as David here, when it will be.

Mine eyes fail for thy word--that is, with yearning desire for Thy word. When the eyes fail, yet faith must not.