smart people are hardworking, but hard-working people are not necessarily smart jobs; we know that people who think far more spend energy than just work hard using muscles, maybe many people think hard work is working with muscles or bodies, but according to I think hard-minded people are more energy-draining. so I prefer to think hard rather than just work hard which results far less, in the future human muscle will be replaced by machine, robot and AI, the ignorant and uneducated person is no longer needed