On a day when life seems like it's just not what you would like it to be (translation: it sucks!), witness something like this and tell me there's absolutely no joy in your life.
Sure, my life doesn't always unfold how I had planned, it's not always easy, and I never seem to have enough money or time or whatever is required of me, but what I do have is an abundance of love and joy (which is the definition of a rich life anyway, isn't it?). On days when "life sucks" that's the fuel one needs to drive them forward.
I challenge you to find your fuel.