> The math part of your brain never shouts equations at you

I'm not so sure. When I don't understand something, often mathematical or related concepts, that I want to understand, sometimes it won't let me go. And I wouldn't say that all my internal "calculations" on the topic can be distilled into thoughts.. in fact, that's why I don't understand it. There are symbols "shouting" at me to form a relationship that I don't fully grasp yet. They are more like images, but non-visual.. they don't yet fall into semantic categories that allow me to express them until I understand them, or you could say that when I learn to express them they take on semantic categories. Either way, non-verbal thoughts definitely occupy unexpected parts of my concentration at pretty regular intervals. Not sure that counts as "shouting" but it's maybe similar.

The sex drive is the most self-important part of the mind. It's the only part proclaiming itself as "indispensable". The feeling in our pants is definitely signalling to us "if I wasn't here feeling these urges our species would be dead by now."

There's still generic variation to the point where for some people this isn't a drive. Sure, it's a trait which self-selects itself for removal, but it's likely polygenic, which means it is much more likely that it can persist across generations despite being selected against. A lot of these things are non-intuitive, like how altruism can persist across generations despite being similar.

This is why high IQ is evolutionarily disadvantageous after a certain point. Probability of mating declines with increasing IQ.

what about food?

Language is just the mind's way of bragging about how many thoughts it has.

Cute, but no other part can proclaim, tell, shout or consider (equations are a notation - a language).

I do agree language is overrated. In some ways, it is a receptacle for thought rather than thought itself.