I had a good uncle . . . . His principal complaint about other human beings was that they seldom noticed it when they were happy. So when we were drinking lemonade under an apple tree in the summer, say, and talking lazily about this and that, almost buzzing like honeybees, [my uncle] would suddenly interrupt the agreeable blather to exclaim, “If this isn’t nice, I don’t know what is.”
So I do the same now, and so do my kids and grandkids. And I urge you to please notice when you are happy, and exclaim or murmur or think at some point, “If this isn’t nice, I don’t know what is.”
–Kurt Vonnegut, from A Man Without a Country