Well I believe that language is Busting thinking,
for example maths, with the symbols and the shapes we boost thinking on maths, while with out it is harder,
I believe smart do not need the language until a limit,
above that limit is the language that boosts and also share language to new generations,
that is why people boost literature, mathematic symbols etc,
language is a way to express not the only one, but also is a way to think fast, and share that thought,
in fact test a mathematic one, he maybe can expressed him shelf in literature well, but when comes to numbers and symbols he is free and fast expressed,
Language is the above of the monkey step.
Ancient Greeks unite language with words,
γλωσσα (tongue) and Λογος (logic, clear think, correct think)
the first is to communicate, the second is to think and find the truth, the act and react etc
for example tongue is hi hello, open the window, I am hungry
Logos is 1+1=2, drink water = good drink poison = bad
both are cnneced with the language we use or realize.