It is incredibly important to have an understanding spouse or partner. I'd argue that your spouse or partner can often be critical to your overall success. I think they have to feel part of the team. My wife shares in the rewards of success and believes in me and my teams, so she is very supportive. This is particularly important when we are struggling or going through a hard time. I can't imagine being in a relationship with a person who wasn't 110% on board with me in a startup.