Stupidity is inborn. You can't help being stupid. Nobody, no matter how strong their character, can will themselves to be more intelligent than they are.
Ignorance, OTOH, can be overcome though education. (I'm not talking about "ignorance" in the sense of "I didn't know that meteor was about to fall on my house", but "willful ignorance" where you could have acquired the knowledge but chose not to.)
I'm now thinking you're using the word stupid to mean "lacking in wisdom" rather than "lacking in intelligence", in which case we probably both mean something close to the same thing.