To be “common” is to be of frequent occurrence; the normative, the usual, simply normal. Two or more people can hold a thing “in common,” making it general commodity. We’ve heard of “common knowledge,” describing something that the majority should generally know. We hear a lot about so-called “common sense,” which isn’t very common and doesn’t make much sense anymore. A group of people could have a “common belief;” a shared belief system that gives identity to and is very important for the group of individuals that hold it. The idea of “common” also expands into mathematics, speech, grammar, anatomy, and law, etc. but the meaning doesn’t drift far from the original intent.

“Unity” is a state of being one; oneness. To speak of “unity” infers combined parts; two or more parts have come (or were put) together to form one whole. Often the ideology of “unity” (oneness) takes on…