Can you think without language? Answer: Nope, at least not at the level humans are accustomed to. That's why deafness can have far more serious consequences than blindness, developmentally speaking.
"What is your dangerous idea? An idea you think about (not necessarily one you originated) that is dangerous not because it is assumed to be false, but because it might be true?" asked to "who's who" of third culture scientists and science-minded thinkers