Psalms 92:15

To shew that the Lord is upright -That is, This will be a proof that God is faithful to his promises; that he is the true friend of his people. The fact that they live long - that they are happy and useful even in old age, will be a demonstration that God is the friend of virtue, and that he deals with people according to their character. He is my rock -He is my defense; that which constitutes my security. See the notes atPsalms 18:2. This is language of strong confidence in view of all that is said in the psalm. And there is no unrighteousness in him -This is said in the most absolute form - implying the most entire confidence. God is altogether to be trusted.