Shortly before I got married, I received a piece of sterling advice that I have been mulling a lot over the last year: “You have a big decision to make: Do you want to be married, or do you want to be right?”

Even a good marriage offers a lot of opportunities for grievance. Suddenly, you cannot make any major decision without consulting this other person -- who will, inconveniently, often have very different ideas from yours about where to live, what to spend the money on, how to raise the children, and whether to turn the basement into a home theater space or a library. (The correct an...