He turned their waters into blood, and slew their fish.
 Their land brought forth frogs in abundance, in the chambers of their kings.
 He spake, and there came divers sorts of flies, and lice in all their coasts.
 He gave them hail for rain, and flaming fire in their land.
 He smote their vines also and their fig trees; and brake the trees of their coasts.
 He spake, and the locusts came, and caterpillers, and that without number,
 And did eat up all the herbs in their land, and devoured the fruit of their ground.
These eight verses are recalling the plagues on Egypt. Most of us know the stories of God using Moses to send the plagues on Egypt because they refused to let the Israelites go and worship Him. These event are written about in Exodus 7-11.
Why does God want us to focus on these plagues? God goes to great lengths and troubles to separate those He has called from those who don’t care about Him. It was through these plagues in Egypt that enables the Lord’s people to escape.
As Christians, we are called to serve Him. Just as God went to dramatic extremes to call the Israelites into His plan of salvation, know that God has called you and me into a plan and is willing to go to great lengths and trouble to call us, separate us from nonbelievers, and keep us as close to Him as possible. One must also note that if we can trust God to get the Israelites out of Egypt (His way and on His timing), then we can trust in God to get us through our lives and guide us through our own tough circumstances, again, through His way and on His timing.