30:7 sit still. There are times when God’s people have done all they know how to do to solve a desperate situation, to no avail. They are then tempted to turn to unbelievers to help them, but this is a dangerous compromise. These are the very situations in which God delights to honor true faith. “Man’s extremity is God’s opportunity.” In such circumstances, the believer is best advised to “sit still,” and let God be his strength. Compare Exodus 14:13.

30:15 your strength. See note on Isaiah 30:7.