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I think you're right there. It might be not physical difficulty. But, more of psychological thing.

I can quote this "Knowledge can sometimes be a burden!". I am not sure who said it though. LOL

 6 days ago 

Everyone with brains, those who think, the ones with a high IQ will say this besides it's also written in the bible and for sure said long before that book was multiplied.

I had no idea that it is written in the bible XD.. But, I totally agree with it. All I know is that philosophers like Nietzsche, Dostoevsky and others, have the same opinion as you about those who think more.