I've started reading the book of Exodus a few days ago, and have just finished the portion about the plagues. Amazing. Every time I read it.
The one theme that has been recorded over and over again is God hardening Pharaoh's heart and then the statement, "...so that you may know that I am the Lord your God."
God wants the glory in all avenues of our lives. He brings the rain. He brings the drought. All for us to magnify Him and proclaim to the world that He is the Sovereign God of the Universe.
And to remind ourselves.
For when we are in a valley or trudging down a path that does not seem to have an end, we must remember He is with us and He wants us to remember this. And never forget. He will not leave His children. He abides with us.
He is the Lord.