Intelligence!
A person with little or no sign of intelligence is a stupid person. This counts in all ways, beginning at the initial stage where he started. We all did not have special intelligence before we were born, we all had to do one thing or another to make things work for us.
So, for a person to be intelligent, he has to put in the work. You study, read well. Learning has its privileges, so you are only doing yourself a favour. So, a stupid person is a person that decides to be stupid by being stupid.
We can always change our situation whenever we want to, that is why a person that shows no sign of intelligence can decide to become a professor and do it. But if he continues to think he is stupid, he will continue to be.
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