This is bad advice to give. It sets a lot of people up for failure with unreasonable expectations.
The correct advice to give is "don't do it. It's really hard and you'll probably fail".
Anyone who quits after receiving that advice was never going to make it anyway.
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"Most people fail, so better don't even try."
Is this genuinely the advice you'd give to someone who's less experienced in life? No wonder society is the way it is, most people have extremely low ambitions and then don't even bother working on those.