The most universally significant word that exists is "Good-Bye" "Hello" is important, and so is "love," but in the end we have to say "good-bye" to everyone and everything, even our very selves. And for most of us, it seems perhaps the most unnatural thing to learn to say. Death, the final good-bye, surprises most of us. And this is why "Good-Bye" is so significant. It is full of sobriety and honesty. It's why some people say "see you later" instead.