Bow thy heavens, O Lord, and come down. The strain changes. From praise of God's loving-kindness and might, the psalmist proceeds to invoke his aid. Taking his metaphors from Psalms 18:9. "Bow thy heavens, O Lord," he says, "and come down" to earth—appear in thy might, to the discomfiture of thy enemies and the relief of thy faithful ones.
Touch the mountains, and they shall smoke. Do as thou wert pleased to do at Sinai, when thou showedst thyself—"Touch the mountains, and let a smoke go up from them" (see Exodus 19:16, Exodus 19:18; Deuteronomy 4:11; Psalms 18:7-14)—a consuming fire, that shall burn up the ungodly.