There is not such a pleasant history for you to read in all the world as the history of your own lives, if you would but sit down and record from the beginning hitherto what God has been to you, and done for you; what signal manifestations and outbreakings of His mercy, faithfulness and love there have been in all the conditions you have passed through. If your hearts do not melt before you have gone half through that history, they are hard hearts indeed.
In the arena
Sit down with a blank page. Write ten specific things God has done for you. Don't be vague. Don't stop at Sunday school answers like "Jesus died for my sins." The list needs to be personal. The job that came through. The sin you overcame. The friend who showed up at the right moment. The prayer He answered in a way you didn't expect. The time He said "no" and now you see it was a blessing. Go back as far as you can remember.
Deuteronomy 8:2 tells Israel to remember the whole way the Lord led them through the wilderness. Recounting the deeds of the Lord was how they kept their hearts from growing hard. You have a history with God. Write it down. Read it back. Soften your heart with gratitude.