Exodus 8:1-9:35
Exodus 8:5-8 The entire land was covered with frogs. This does not say the same thing happened with the magicians. It just says they made frogs come up out of the land. Was this demonic power, or just a great magic trick?
Here is what we know, that the land was covered with frogs from Aaron's deed, and the magicians could not make the frogs go away.

Exodus 8:18-19 The fact that the magicians could not duplicate the gnats would make it appear that the previous deeds were tricks.

Exodus 9:6-7 The pestilence did not touch the Israelites. Those who are pre-tribulation argue that Christians cannot go through any of the tribulation because God would not allow any harm to come to Christians. This verse shows that there is the possibility for God's judgment on land and people yet Christians not be harmed because they are removed from the harm, but that they are protected from the harm.
The story of Noah is another example. God did not take Noah out of the flood, He just provided a means to be protected from the flood.

Exodus 9:20-21 With all the other plagues that occurred, it was stupid for some of the servants to pay no regard to the Word of God.

Matthew 19:13-30
Matthew 19:22 We do not know if the young man later repented.
Matthew 19:29 Whatever sacrifice we make for God is well worth it.

Psalm 24:1-10
Psalm 24:3-6 There are rewards for those who walk in purity

Proverbs 6:1-5
Proverbs 6:1-4 Should not be a co-signer for someone.
Proverbs 6:5 We should have a job.