It reminds us that patience and love are two of the core essences of our being, or at least it is for some! Personally, I hated my father and was glad when he died and there is not a forgiving bone in my body towards him, I still do not miss him today.
For me, it is a reminder that some dads can be loving and thoughtful and still have patience when their kids get a bit grumpy, like we all do from time to time. And I hope that my kids think of me in that way even although I recognise that at times I was not the best father in the world......