Likewise, with your dad, what's laudable is the result. What's not laudable is the process. I'm sure that your dad would have jumped at the opportunity to make the same amount of money for fewer hours worked every day.
In life, you don't get credit for trying. You get credits for results. Yes, working hard is necessary. It's not sufficient, though. You need a lot of luck to strike it rich like jwz did. That's the point he's trying to make. Sometimes, you work 16, 20 hour days, and you just go home bankrupt because the market just isn't there, the investors aren't willing to believe, and the customers don't give a damn. Then what do you have? You've ruined your health, you've alienated your family, you've isolated yourself for what? A dream. An illusion.
I'm not trying to take anything away from your dad. Those 16 hour days had value. But let's not pretend that there was zero luck involved. What if the travel agency hadn't given him rentals? What if his taxi had broken down and he'd been forced into debt in order to secure repairs? What if he'd come down with diabetes, heart disease, cancer, or any number of ailments that could have ended his career? All those things (and many many more) would have prevented him from being able to provide you with that college education.
So yeah, definitely celebrate hard work. But don't pretend that pure hard work and saving money gives you the ability to stand on your own two legs. Those are the prerequisites, but there's a whole lot of other things that have to go right for everything to turn out well.