Graham and Erik discuss the role of the spouse especially if you want to start a business and live a life some uncertainty. For long term success, you need a spouse that supports you. Building a business is not a short term project it takes stamina. The best chance of success is if one of the partners keeps the dayjob and the other one ventures out in business.

source article:
https://hbr.org/2017/10/if-you-cant-find-a-spouse-who-supports-your-career-stay-single