What's the most important thing in a marriage?

There're many important things in a marriage and it's hard to say what is the most important. For example, expectation management is very important. Most disappointments or arguments in a marriage come from when your partner fails to meet our expectations. It's important to communicate your expectations of each other regularly. It's also important to remember that what work for other couples or whatever the social norms are may not apply for you, and that is ok.