as some one who speaks two languages and is commonly labelled a genius (against my wishes) i feel i have some valid input here...<p>i do not have particularly great self-control and discipline.<p>one data point, but still, since its myself i do feel quite strongly that the idea that bilingual people have better discipline is an over generalisation.<p>in particular, living in the uk, where most people speak english as their only language, most of the people i consider to be substantially smarter and more eloquent than myself are not bilingual.<p>so the idea that bilingual people have a cognitive advantage is completely at odds with my personal experiences.