Interestingly, most of the arguments against language influencing thought that I've seen wind up showing the grammar doesn't influence thought. Basically the biggest effect language has on thought is via vocabulary, which must be really disappointing news to all the grammar nerds obsessing over the perfect grammar to give their conlang.
Yes, this is true. Consensus is largely that language can certainly influence thought in language-specific domains, and that it can influence aspects of cognition in other domains, but only to the extent of shifting probabilities and defaults around --- not to the extent of controlling how speakers think or preventing some types of thought according to languages spoken.
Most "grammar nerds" I know are linguists, who think this is neat because they're more interested in how language works on a more fundamental level than individual grammars (though...
Another month, another rationality quotes thread. The rules are: