His Mercy Endureth Forever

I just finished the Psalms in my 90 Days through the Bible. There is such comfort in that book, but one Psalm that really hit me this time was Psalm 136.
If you read through the book it shows how God was always there for Israel. It shows victories that He gave them.
The thing that hit me about the chapter is that every verse ends in these words, "For His mercy endureth forever."
Mercy is an awesome thing. We don't get what we deserve because God loves us. If you look at Israel's history there were many times that they turned their backs on God. He could've destroyed them and found a new people, but He showed mercy. He gave them chance after chance.
He's done the same for me. I could write my a Psalm of my own. It'd go something like this:

God sent Jesus to die for Heather's sins, for His mercy endureth forever.
He gave her wonderful Christian parents, for His mercy endureth forever.
He gave her a supportive church family, for His mercy endureth forever.
He allowed her to use her talents for Him, for His mercy endureth forever.

And it could go on and on. I deserve none of God's mercy, but He gives it to me over and over. I don't understand why.
Think about your life today. What would your Psalm consist of?