As they say, nothing good comes quite easy. Such is the case of success. It's not handed out easily. The price has to be paid. No successful person ever made it without sacrifice, the reason we give up several things in the bid to achieve certain level of success.
It's important to also work smart and been determined i.e staying on course to that set goal no matter how difficult it might be. Resilience is one quality that put them Forbes dudes on there. They don't quit no matter the opposition.
Indeed those who quit never win. Before starting anything worthwhile, we ought to carefully be ready for it so that when them trails rear up their ugly head, one won't be consumed by rather walk through it with boldness and gazing towards the ultimate prize. Enjoy your day too man