/lit/ - Literature

Can one become a great writer without being intellectually gifted? Any example?

I was reading about psychometrics and how general intelligence is a really strong predictor of success in several areas, and more specifically, how language and math skills are highly correlated. This really struck me, seeing that i heard several times people saying that they were bad at math but good at writing or vice-versa. This also make me really depressed because i always thought that good writing was a form of self expression that had a deeper meaning and was depended of several non quantifiable human characteristics rather than a pure measurable skill.

Whats /lit/ thoughts on this?