"We, though many, are one ..." --Rom 12:5
I like the little stickers they give you at the polling place for showing up to vote. I wear mine all day, glad I got to participate.
The common good is one of the basic social justice principles, and I apply this to ballot issues that may not affect me directly but serve the general good. Retired seniors do this when they support school bonds or sales tax initiatives for projects they won't benefit from personally but that are good for the community.