15. You have with Your [mighty] arm redeemed Your people, the sons of Jacob and Joseph. Selah [pause, and calmly think of that]!
16. When the waters [at the Red Sea and the Jordan] saw You, O God, they were afraid; the deep shuddered also, for [all] the waters saw You.
17. The clouds poured down water, the skies sent out a sound [of rumbling thunder]; Your arrows went forth [in forked lightning].
18. The voice of Your thunder was in the whirlwind, the lightnings illumined the world; the earth trembled and shook.