Hard work alone, absent luck, will never assure success, especially not material success. Due to my unusual work history in Guatemala and Silicon Valley and other tech centers of the U.S., I can say with certainty that the hardest working people I ever met were not the CEOs in startups. Sure, I've done my 100 hour weeks, and yes, it's all very hard, but not the hardest work. Don't fool yourself. Poor women in Guatemala making shoes in a factory and going home to feed their families without lights, electricity or transport, cooking over wood fires and doing laundry in a stream with rocks, and raising half a dozen children, are all working harder than any startup CEO can imagine.
Closer to home, here in Silicon Valley, I know people who work as cleaners, everyday, from dawn to dark, for very little money. I'd say much harder than any CEO.
Don't flatter yourself. If you are a big material success, you didn't earn it by being the hardest worker in the world. Lots of people work much harder for much less. Never forget how much you owe to luck for your success. If Bill Gates had been born in 6th century Eritrea to goatherds, he would have been a very poor, very shitty goatherd, losing his flock due to bad eyesight. We all owe a great deal to luck. Certainly more than to hard work. Get over yourself and be grateful.