 The stoics were also intrigued by ambiguity (see Atherton 1993). Chrysippus claimed at one point that every word is ambiguous – though by this he meant that the same person may understand a word spoken to him in many distinct ways. Philosophers concerned with the relation between language and thought, particularly those who argue for a language of thought, concerned themselves with whether the language in which we think could contain ambiguous phrases. Ockham, for example, was willing to countenance ambiguities in mental sentences of a language of thought but not mental terms in that language (see Spade p. 101). Frege contemplated non-overlap of sense in natural language in a famous footnote, writing: