There's some truth to the saying. But it has its limits. One needs to honestly be working on improving themselves in the direction that one is faking.
On another note - I love the Wizard of Oz. I love it because it's a story about a journey, friends encountered along the way, friends who each have their failings but are loved within the group. A story of empowerment (one of the first female heroes of the modern era), and about reality vs image.
I don't know the deep details of the story but the band of new friends take a road trip to see the Wizard - an all powerful one who is believed to have huge power to affect others' lives. A belief the Wizard encourages.
They eventually see a quirky man of short stature, more bent than them, behind a curtain, pulling levers and transforming his voice into a booming thunder through a microphone and amplifier.
And so back to my point. "fake it till you make it" has some natural limits. Many times, the booming authority you are hearing is a little man behind a curtain.
If you try to "fake it till you make it" for too long all you're left with is the faking. And then you're paralysed by the fear that you'll be discovered. It represents a downward spiral that can turn a good person into a sneaky and undermining political animal.
The antidote - honesty. With yourself and with the people around you. Don't become the man behind the curtain.
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