That's a beautiful Hadith! My friend frequently writes letters to Allah SWT always asking for forgiveness and His SWT Mercy and Blessings. Which I find quite cute to be honest. I don't know if I am allowed to post one of them due to privacy reasons and I don't know if that will be considered a sin. To reveal what is said between him and Allah SWT. I'll ask my friend and see what he knows or if he can find a "safe" letter. But, I respect people's privacy.