To show that the Lord is upright. The happy and flourishing old age of the righteous (Psalms 92:14; comp. Psalms 91:16) is a strong indication of God's faithfulness and truth, showing, as its does, that he keeps his promises, and never forsakes those that put their trust in him (comp. Psalms 27:10; Psalms 37:25; Isaiah 41:17, etc.). He is my Rock—rather, that he is my Rock—and that there is no unrighteousness in him. Both clauses depend on the "show" of the preceding hemistich.
HOMILETICS