SummaryI argue that (i) language is a social phenomenon and that (ii) thoughts take place in a linguistic medium of representation. Davidson's private language (“idiolectic”) approach to communication is reviewed and criticised in sections 2 and 3, respectively. It is shown that Dretske's recent definition of thought is not narrow enough to exclude algorithmic symbol manipulations done by computers from being thoughts. The difference between mere algorithmic symbol manipulation and thought is to be found in the human ability to infer the truth value of certain self‐referential representations such as Gödel sentences (sections 4 and 5). Section 4 also contains an argument to the effect that only universal linguistic systems allow for the construction of such decidable self‐referential representations and are, therefore, the only appropriate media of thought. Some speculations on the relation between thought and internal symbol manipulation follow. The whole issue discussed in this essay indicates that some form of externalism is required to account for