18 25 To the faithful you show yourself faithful, to the blameless you show yourself blameless, 26 to the pure you show yourself pure, but to the crooked you show yourself shrewd. 27 You save the humble but bring low those whose eyes are haughty. The Psalms pronounce the mirror of Gods attributes. We naturally desire to trade the bad with the good in order to be acceptable to God. You would think that he is saying if we are blameless then God shows Himself as blameless. But if you notice that He puts this into context by the contrast between the humble person and the arrogant man. A humble person does not claim that God is dependent upon his own purity as proof that he is pure. Thats how an arrogant person reasons. We are humble because we depend upon Gods pronouncements as the mirror of His works of faithfulness , purity etc. Instead of replacing the negative with the positive we are incorporating Gods purity , faithfulness etc in pronouncing the axioms.