ROI

As with every investment decision, there will undoubtedly come a time when you've gotta sit down, reassess the situation, and seriously think about how much effort/time/energy/emotion you've put, are putting, and/or will continue to put into achieving your dreams/desires/visions/plans. And whether or not it's going to really be worth all the muscle/sweat/blood/brain/tears at the end of the day. Cos if it's not, it's time to walk away. But if it is, and you decide to stay, you've gotta be committed to try/work/fight/exert all the way.