Most rewarding thing about being an entrepreneur?

I get to choose when I work... So here I am, it's 6.18 AM and I started work more than 30 minutes ago. We work a lot more because we don't want to work at other people's terms

Awakening every day with the stamina and passion to conquer the world with all the fresh ideas and strategies and driven by the desire to uplift my project to new heights.

I would say : working for yourself, where and whenever you want. But you'll probably work way more than expected. But : "Find a job you enjoy doing, and you will never have to work a day in your life."