The ability to think is genetic. Thinking, though, requires some inbuilt logic. Therefore logic must precede thought but where did that logic come from? Perhaps it emerges with thought. Humans are not unique as a species in being able to think.
Thought gives rise to meanings. The capability for language is genetic. The need to communicate meanings leads to the invention of languages. (“Language” is discovered but “languages” are invented). Many animals have some form of language. Humans are unique as a species in having written language and in being able to record language. (But animals do make use of some media which humans cannot: scent, ultrasound ..).
And when we meet our nearest aliens who “speak” to each other in bursts of X-rays we should not assume that they are backward because they don’t speak English.
It would seem that the capability for thought and language ability are both genetic and must exist simultaneously. It is not that either thought or language ability are a consequence of the other, but we must distinguish between the ability to have language and specific languages. It may well be that language ability and thinking ability only can appear together. The sequence is from thought to meaning to expressions of meaning using an invented language as a tool. However humans are also unique in the feedback loop between language and thought which raises thinking to heights not seen in any other species.
We invent words to express meanings. We invent grammars as rules to combine words to enable more complex meanings and to give precision in communication. There are many meanings for which we do not yet have words. But the languages and the words we invent are capable of expressing many more meanings than our thought can grasp.
We can juxtapose words and comply with grammar, but they give meanings which tantalizingly elude thought.
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