7 The earth trembled and quaked, and the foundations of the mountains shook; they trembled because he was angry. 8 Smoke rose from his nostrils; consuming fire came from his mouth, burning coals blazed out of it. 9 He parted the heavens and came down; dark clouds were under his feet. 10 He mounted the cherubim and flew; he soared on the wings of the wind. 11 He made darkness his covering, his canopy around him- the dark rain clouds of the sky. 12 Out of the brightness of his presence clouds advanced, with hailstones and bolts of lightning. 13 The Lord thundered from heaven; the voice of the Most High resounded.[1] 14 He shot his arrows and scattered the enemy, with great bolts of lightning he routed them. 15 The valleys of the sea were exposed and the foundations of the earth laid bare at your rebuke, Lord, at the blast of breath from your nostrils.

Matthew Henry's Commentary on Psalm 18:7-15

Commentary on Psalm 18:1-19

(Read Psalm 18:1-19)

The first words, "I will love thee, O Lord, my strength," are the scope and contents of the psalm. Those that truly love God, may triumph in him as their Rock and Refuge, and may with confidence call upon him. It is good for us to observe all the circumstances of a mercy which magnify the power of God and his goodness to us in it. David was a praying man, and God was found a prayer-hearing God. If we pray as he did, we shall speed as he did. God's manifestation of his presence is very fully described, Hebrews 5:7. God made the earth to shake and tremble, and the rocks to cleave, and brought him out, in his resurrection, because he delighted in him and in his undertaking.