David, being oppressed, is here waiting and wishing for the salvation of the Lord, which would make him easy. 1. He cannot but think that it comes slowly: My eyes fail for thy salvation. His eyes were towards it and had been long so. He looked for help from heaven (and we deceive ourselves if we look for it any other way), but it did not come so soon as he expected, so that his eyes began to fail, and he was sometimes ready to despair, and to think that, because the salvation did not come when he looked for it, it would never come. It is often the infirmity even of good men to be weary of waiting God's time when their time has elapsed. 2. Yet he cannot hope that it comes surely; for he expects the word of God's righteousness, and no other salvation than what is secured by that word, which cannot fall to the ground because it is a word of righteousness. Though our eyes fail, yet God's word does not, and therefore those that build upon it, though now discouraged, shall in due time see his salvation.