First, Divinity understands Who and What It Is, and so It is aware that God cannot possibly be hurt or damaged, injured or diminished in any way. This means that Divinity would not be disappointed or frustrated or annoyed or angry or vengeful for any reason. It simply has no reason. “Vengeance is mine, sayeth the Lord” is, I believe, the biggest spiritual untruth of all time.
To be grateful for the good things that happen in our lives is easy, but to be grateful for all our lives—the good as well as the bad, the moments of joy as well as the moments of sorrow, the successes as well as the failures, the rewards as well as the rejections—that requires hard spiritual work. Still, we are only truly grateful people when we can say thank you to all that has brought us to the present moment.