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You're right. Not the only thing, but definitely an important one!

It makes up for a lot of other things.

The dumbest person in the world who is consistent will achieve more than the smartest person who haphazardly shows up.

True! I know someone of both types and indeed the first one is getting further in his life although being less 'book-smart'

Book smart tend to want to rest on their "smarts" and overlook the fact that work is required.

I agree. Need to put effort in if you want to get somewhere!