[rspeer]

> If you can't express something in your language then you are unlikely to even think it.

This is a fairly strong statement of the Sapir-Whorf hypothesis, which is not widely believed.

You can state the hypothesis in various ways, ranging from the strong hypothesis ("you can't think things that aren't in your language", which is clearly false because you can learn new things about language) to weak ("language kinda influences your thoughts").

There is evidence in favor of what I'd call the "extremely weak Sapir-Whorf hypothesis": that language can influence the way you judge things that are established by convention such as colors and directions, in experiments that are specifically designed to emphasize these distinctions, sometimes.